diff --git a/bin/easystar-0.3.0.min.js b/bin/easystar-0.3.0.min.js
deleted file mode 100644
index 8251739..0000000
--- a/bin/easystar-0.3.0.min.js
+++ /dev/null
@@ -1 +0,0 @@
-var EasyStar=function(t){function n(o){if(e[o])return e[o].exports;var i=e[o]={exports:{},id:o,loaded:!1};return t[o].call(i.exports,i,i.exports,n),i.loaded=!0,i.exports}var e={};return n.m=t,n.c=e,n.p="",n(0)}([function(t,n,e){var o={},i=e(1),r=e(2),s=e(3);const a=0,u=1;t.exports=o,o.js=function(){var t,n,e,o=1,c=1.4,l=!1,h={},p={},f={},d=!0,y=[],v=Number.MAX_VALUE,g=!1;this.setAcceptableTiles=function(t){t instanceof Array?e=t:!isNaN(parseFloat(t))&&isFinite(t)&&(e=[t])},this.enableSync=function(){l=!0},this.disableSync=function(){l=!1},this.enableDiagonals=function(){g=!0},this.disableDiagonals=function(){g=!1},this.setGrid=function(n){t=n;for(var e=0;e<t.length;e++)for(var o=0;o<t[0].length;o++)p[t[e][o]]||(p[t[e][o]]=1)},this.setTileCost=function(t,n){p[t]=n},this.setAdditionalPointCost=function(t,n,e){f[t+"_"+n]=e},this.removeAdditionalPointCost=function(t,n){delete f[t+"_"+n]},this.removeAllAdditionalPointCosts=function(){f={}},this.setIterationsPerCalculation=function(t){v=t},this.avoidAdditionalPoint=function(t,n){h[t+"_"+n]=1},this.stopAvoidingAdditionalPoint=function(t,n){delete h[t+"_"+n]},this.enableCornerCutting=function(){d=!0},this.disableCornerCutting=function(){d=!1},this.stopAvoidingAllAdditionalPoints=function(){h={}},this.findPath=function(n,r,a,u,c){var h=function(t){l?c(t):setTimeout(function(){c(t)})};if(void 0===e)throw new Error("You can't set a path without first calling setAcceptableTiles() on EasyStar.");if(void 0===t)throw new Error("You can't set a path without first calling setGrid() on EasyStar.");if(0>n||0>r||0>a||0>u||n>t[0].length-1||r>t.length-1||a>t[0].length-1||u>t.length-1)throw new Error("Your start or end point is outside the scope of your grid.");if(n===a&&r===u)return void h([]);for(var p=t[u][a],f=!1,d=0;d<e.length;d++)if(p===e[d]){f=!0;break}if(f===!1)return void h(null);var v=new i;v.openList=new s(function(t,n){return t.bestGuessDistance()-n.bestGuessDistance()}),v.isDoneCalculating=!1,v.nodeHash={},v.startX=n,v.startY=r,v.endX=a,v.endY=u,v.callback=h,v.openList.push(A(v,v.startX,v.startY,null,o)),y.push(v)},this.calculate=function(){if(0!==y.length&&void 0!==t&&void 0!==e)for(n=0;v>n;n++){if(0===y.length)return;if(l&&(n=0),0!==y[0].openList.size()){var i=y[0].openList.pop();if(y[0].endX===i.x&&y[0].endY===i.y){y[0].isDoneCalculating=!0;var r=[];r.push({x:i.x,y:i.y});for(var s=i.parent;null!=s;)r.push({x:s.x,y:s.y}),s=s.parent;r.reverse();var u=y[0],h=r;return void u.callback(h)}var p=[];i.list=a,i.y>0&&p.push({instance:y[0],searchNode:i,x:0,y:-1,cost:o*m(i.x,i.y-1)}),i.x<t[0].length-1&&p.push({instance:y[0],searchNode:i,x:1,y:0,cost:o*m(i.x+1,i.y)}),i.y<t.length-1&&p.push({instance:y[0],searchNode:i,x:0,y:1,cost:o*m(i.x,i.y+1)}),i.x>0&&p.push({instance:y[0],searchNode:i,x:-1,y:0,cost:o*m(i.x-1,i.y)}),g&&(i.x>0&&i.y>0&&(d||b(t,e,i.x,i.y-1)&&b(t,e,i.x-1,i.y))&&p.push({instance:y[0],searchNode:i,x:-1,y:-1,cost:c*m(i.x-1,i.y-1)}),i.x<t[0].length-1&&i.y<t.length-1&&(d||b(t,e,i.x,i.y+1)&&b(t,e,i.x+1,i.y))&&p.push({instance:y[0],searchNode:i,x:1,y:1,cost:c*m(i.x+1,i.y+1)}),i.x<t[0].length-1&&i.y>0&&(d||b(t,e,i.x,i.y-1)&&b(t,e,i.x+1,i.y))&&p.push({instance:y[0],searchNode:i,x:1,y:-1,cost:c*m(i.x+1,i.y-1)}),i.x>0&&i.y<t.length-1&&(d||b(t,e,i.x,i.y+1)&&b(t,e,i.x-1,i.y))&&p.push({instance:y[0],searchNode:i,x:-1,y:1,cost:c*m(i.x-1,i.y+1)}));for(var f=!1,A=0;A<p.length;A++)if(x(p[A].instance,p[A].searchNode,p[A].x,p[A].y,p[A].cost),p[A].instance.isDoneCalculating===!0){f=!0;break}f&&y.shift()}else{var u=y[0];u.callback(null),y.shift()}}};var x=function(n,o,i,r,s){var a=o.x+i,c=o.y+r;if(void 0===h[a+"_"+c]&&b(t,e,a,c)){var l=A(n,a,c,o,s);void 0===l.list?(l.list=u,n.openList.push(l)):o.costSoFar+s<l.costSoFar&&(l.costSoFar=o.costSoFar+s,l.parent=o,n.openList.updateItem(l))}},b=function(t,n,e,o){for(var i=0;i<n.length;i++)if(t[o][e]===n[i])return!0;return!1},m=function(n,e){return f[n+"_"+e]||p[t[e][n]]},A=function(t,n,e,o,i){if(void 0!==t.nodeHash[n+"_"+e])return t.nodeHash[n+"_"+e];var s=w(n,e,t.endX,t.endY);if(null!==o)var a=o.costSoFar+i;else a=0;var u=new r(o,n,e,a,s);return t.nodeHash[n+"_"+e]=u,u},w=function(t,n,e,o){if(g){var i=Math.abs(t-e),r=Math.abs(n-o);return r>i?c*i+r:c*r+i}var i=Math.abs(t-e),r=Math.abs(n-o);return i+r}}},function(t,n){t.exports=function(){this.isDoneCalculating=!0,this.pointsToAvoid={},this.startX,this.callback,this.startY,this.endX,this.endY,this.nodeHash={},this.openList}},function(t,n){t.exports=function(t,n,e,o,i){this.parent=t,this.x=n,this.y=e,this.costSoFar=o,this.simpleDistanceToTarget=i,this.bestGuessDistance=function(){return this.costSoFar+this.simpleDistanceToTarget}}},function(t,n,e){t.exports=e(4)},function(t,n,e){var o,i,r;(function(){var e,s,a,u,c,l,h,p,f,d,y,v,g,x,b;a=Math.floor,d=Math.min,s=function(t,n){return n>t?-1:t>n?1:0},f=function(t,n,e,o,i){var r;if(null==e&&(e=0),null==i&&(i=s),0>e)throw new Error("lo must be non-negative");for(null==o&&(o=t.length);o>e;)r=a((e+o)/2),i(n,t[r])<0?o=r:e=r+1;return[].splice.apply(t,[e,e-e].concat(n)),n},l=function(t,n,e){return null==e&&(e=s),t.push(n),x(t,0,t.length-1,e)},c=function(t,n){var e,o;return null==n&&(n=s),e=t.pop(),t.length?(o=t[0],t[0]=e,b(t,0,n)):o=e,o},p=function(t,n,e){var o;return 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\ No newline at end of file
diff --git a/bin/easystar-0.3.0.js b/bin/easystar-0.3.1.js
similarity index 92%
rename from bin/easystar-0.3.0.js
rename to bin/easystar-0.3.1.js
index 1e0f601..bba7e1b 100644
--- a/bin/easystar-0.3.0.js
+++ b/bin/easystar-0.3.1.js
@@ -49,7 +49,7 @@ var EasyStar =
 	*   EasyStar.js
 	*   github.com/prettymuchbryce/EasyStarJS
 	*   Licensed under the MIT license.
-	* 
+	*
 	*   Implementation By Bryce Neal (@prettymuchbryce)
 	**/
 
@@ -71,6 +71,7 @@ var EasyStar =
 	    var collisionGrid;
 	    var costMap = {};
 	    var pointsToCost = {};
+	    var directionalConditions = {};
 	    var allowCornerCutting = true;
 	    var iterationsSoFar;
 	    var instances = [];
@@ -80,8 +81,8 @@ var EasyStar =
 
 	    /**
 	    * Sets the collision grid that EasyStar uses.
-	    * 
-	    * @param {Array|Number} tiles An array of numbers that represent 
+	    *
+	    * @param {Array|Number} tiles An array of numbers that represent
 	    * which tiles in your grid should be considered
 	    * acceptable, or "walkable".
 	    **/
@@ -126,8 +127,8 @@ var EasyStar =
 
 	    /**
 	    * Sets the collision grid that EasyStar uses.
-	    * 
-	    * @param {Array} grid The collision grid that this EasyStar instance will read from. 
+	    *
+	    * @param {Array} grid The collision grid that this EasyStar instance will read from.
 	    * This should be a 2D Array of Numbers.
 	    **/
 	    this.setGrid = function (grid) {
@@ -183,11 +184,30 @@ var EasyStar =
 	    };
 
 	    /**
-	    * Sets the number of search iterations per calculation. 
-	    * A lower number provides a slower result, but more practical if you 
+	    * Sets a directional condition on a tile
+	    *
+	    * @param {Number} x The x value of the point.
+	    * @param {Number} y The y value of the point.
+	    * @param {Array.<String>} allowedDirections A list of all the allowed directions that can access
+	    * the tile.
+	    **/
+	    this.setDirectionalCondition = function (x, y, allowedDirections) {
+	        directionalConditions[x + '_' + y] = allowedDirections;
+	    };
+
+	    /**
+	    * Remove all directional conditions
+	    **/
+	    this.removeAllDirectionalConditions = function () {
+	        directionalConditions = {};
+	    };
+
+	    /**
+	    * Sets the number of search iterations per calculation.
+	    * A lower number provides a slower result, but more practical if you
 	    * have a large tile-map and don't want to block your thread while
 	    * finding a path.
-	    * 
+	    *
 	    * @param {Number} iterations The number of searches to prefrom per calculate() call.
 	    **/
 	    this.setIterationsPerCalculation = function (iterations) {
@@ -195,7 +215,7 @@ var EasyStar =
 	    };
 
 	    /**
-	    * Avoid a particular point on the grid, 
+	    * Avoid a particular point on the grid,
 	    * regardless of whether or not it is an acceptable tile.
 	    *
 	    * @param {Number} x The x value of the point to avoid.
@@ -238,14 +258,14 @@ var EasyStar =
 
 	    /**
 	    * Find a path.
-	    * 
+	    *
 	    * @param {Number} startX The X position of the starting point.
 	    * @param {Number} startY The Y position of the starting point.
 	    * @param {Number} endX The X position of the ending point.
 	    * @param {Number} endY The Y position of the ending point.
 	    * @param {Function} callback A function that is called when your path
 	    * is found, or no path is found.
-	    * 
+	    *
 	    **/
 	    this.findPath = function (startX, startY, endX, endY, callback) {
 	        // Wraps the callback for sync vs async logic
@@ -436,7 +456,7 @@ var EasyStar =
 	        var adjacentCoordinateX = searchNode.x + x;
 	        var adjacentCoordinateY = searchNode.y + y;
 
-	        if (pointsToAvoid[adjacentCoordinateX + "_" + adjacentCoordinateY] === undefined && isTileWalkable(collisionGrid, acceptableTiles, adjacentCoordinateX, adjacentCoordinateY)) {
+	        if (pointsToAvoid[adjacentCoordinateX + "_" + adjacentCoordinateY] === undefined && isTileWalkable(collisionGrid, acceptableTiles, adjacentCoordinateX, adjacentCoordinateY, searchNode)) {
 	            var node = coordinateToNode(instance, adjacentCoordinateX, adjacentCoordinateY, searchNode, cost);
 
 	            if (node.list === undefined) {
@@ -451,7 +471,17 @@ var EasyStar =
 	    };
 
 	    // Helpers
-	    var isTileWalkable = function (collisionGrid, acceptableTiles, x, y) {
+	    var isTileWalkable = function (collisionGrid, acceptableTiles, x, y, sourceNode) {
+	        if (directionalConditions[x + "_" + y]) {
+	            var direction = calculateDirection(sourceNode.x - x, sourceNode.y - y);
+	            var directionIncluded = function () {
+	                for (var i = 0; i < directionalConditions[x + "_" + y].length; i++) {
+	                    if (directionalConditions[x + "_" + y][i] === direction) return true;
+	                }
+	                return false;
+	            };
+	            if (!directionIncluded()) return false;
+	        }
 	        for (var i = 0; i < acceptableTiles.length; i++) {
 	            if (collisionGrid[y][x] === acceptableTiles[i]) {
 	                return true;
@@ -461,6 +491,16 @@ var EasyStar =
 	        return false;
 	    };
 
+	    /**
+	     * -1, -1 | 0, -1  | 1, -1
+	     * -1,  0 | SOURCE | 1,  0
+	     * -1,  1 | 0,  1  | 1,  1
+	     */
+	    var calculateDirection = function (diffX, diffY) {
+	        if (diffX === 0, diffY === -1) return EasyStar.BOTTOM;else if (diffX === 1, diffY === -1) return EasyStar.BOTTOM_LEFT;else if (diffX === 1, diffY === 0) return EasyStar.LEFT;else if (diffX === 1, diffY === 1) return EasyStar.TOP_LEFT;else if (diffX === 0, diffY === 1) return EasyStar.TOP;else if (diffX === -1, diffY === 1) return EasyStar.TOP_RIGHT;else if (diffX === -1, diffY === 0) return EasyStar.RIGHT;else if (diffX === -1, diffY === -1) return EasyStar.BOTTOM_RIGHT;
+	        throw new Error('These differences are not valid: ' + diffX + ', ' + diffY);
+	    };
+
 	    var getTileCost = function (x, y) {
 	        return pointsToCost[x + '_' + y] || costMap[collisionGrid[y][x]];
 	    };
@@ -499,6 +539,15 @@ var EasyStar =
 	    };
 	};
 
+	EasyStar.TOP = 'TOP';
+	EasyStar.TOP_RIGHT = 'TOP_RIGHT';
+	EasyStar.RIGHT = 'RIGHT';
+	EasyStar.BOTTOM_RIGHT = 'BOTTOM_RIGHT';
+	EasyStar.BOTTOM = 'BOTTOM';
+	EasyStar.BOTTOM_LEFT = 'BOTTOM_LEFT';
+	EasyStar.LEFT = 'LEFT';
+	EasyStar.TOP_LEFT = 'TOP_LEFT';
+
 /***/ },
 /* 1 */
 /***/ function(module, exports) {
diff --git a/bin/easystar-0.3.1.min.js b/bin/easystar-0.3.1.min.js
new file mode 100644
index 0000000..049c37c
--- /dev/null
+++ b/bin/easystar-0.3.1.min.js
@@ -0,0 +1 @@
+var EasyStar=function(t){function n(o){if(e[o])return e[o].exports;var r=e[o]={exports:{},id:o,loaded:!1};return t[o].call(r.exports,r,r.exports,n),r.loaded=!0,r.exports}var e={};return n.m=t,n.c=e,n.p="",n(0)}([function(t,n,e){var o={},r=e(1),i=e(2),s=e(3);const u=0,a=1;t.exports=o,o.js=function(){var t,n,e,c=1,l=1.4,h=!1,p={},f={},d={},y={},v=!0,T=[],g=Number.MAX_VALUE,x=!1;this.setAcceptableTiles=function(t){t instanceof Array?e=t:!isNaN(parseFloat(t))&&isFinite(t)&&(e=[t])},this.enableSync=function(){h=!0},this.disableSync=function(){h=!1},this.enableDiagonals=function(){x=!0},this.disableDiagonals=function(){x=!1},this.setGrid=function(n){t=n;for(var e=0;e<t.length;e++)for(var o=0;o<t[0].length;o++)f[t[e][o]]||(f[t[e][o]]=1)},this.setTileCost=function(t,n){f[t]=n},this.setAdditionalPointCost=function(t,n,e){d[t+"_"+n]=e},this.removeAdditionalPointCost=function(t,n){delete d[t+"_"+n]},this.removeAllAdditionalPointCosts=function(){d={}},this.setDirectionalCondition=function(t,n,e){y[t+"_"+n]=e},this.removeAllDirectionalConditions=function(){y={}},this.setIterationsPerCalculation=function(t){g=t},this.avoidAdditionalPoint=function(t,n){p[t+"_"+n]=1},this.stopAvoidingAdditionalPoint=function(t,n){delete p[t+"_"+n]},this.enableCornerCutting=function(){v=!0},this.disableCornerCutting=function(){v=!1},this.stopAvoidingAllAdditionalPoints=function(){p={}},this.findPath=function(n,o,i,u,a){var l=function(t){h?a(t):setTimeout(function(){a(t)})};if(void 0===e)throw new Error("You can't set a path without first calling setAcceptableTiles() on EasyStar.");if(void 0===t)throw new Error("You can't set a path without first calling setGrid() on EasyStar.");if(0>n||0>o||0>i||0>u||n>t[0].length-1||o>t.length-1||i>t[0].length-1||u>t.length-1)throw new Error("Your start or end point is outside the scope of your grid.");if(n===i&&o===u)return void l([]);for(var p=t[u][i],f=!1,d=0;d<e.length;d++)if(p===e[d]){f=!0;break}if(f===!1)return void l(null);var y=new r;y.openList=new s(function(t,n){return t.bestGuessDistance()-n.bestGuessDistance()}),y.isDoneCalculating=!1,y.nodeHash={},y.startX=n,y.startY=o,y.endX=i,y.endY=u,y.callback=l,y.openList.push(A(y,y.startX,y.startY,null,c)),T.push(y)},this.calculate=function(){if(0!==T.length&&void 0!==t&&void 0!==e)for(n=0;g>n;n++){if(0===T.length)return;if(h&&(n=0),0!==T[0].openList.size()){var o=T[0].openList.pop();if(T[0].endX===o.x&&T[0].endY===o.y){T[0].isDoneCalculating=!0;var r=[];r.push({x:o.x,y:o.y});for(var i=o.parent;null!=i;)r.push({x:i.x,y:i.y}),i=i.parent;r.reverse();var s=T[0],a=r;return void s.callback(a)}var p=[];o.list=u,o.y>0&&p.push({instance:T[0],searchNode:o,x:0,y:-1,cost:c*m(o.x,o.y-1)}),o.x<t[0].length-1&&p.push({instance:T[0],searchNode:o,x:1,y:0,cost:c*m(o.x+1,o.y)}),o.y<t.length-1&&p.push({instance:T[0],searchNode:o,x:0,y:1,cost:c*m(o.x,o.y+1)}),o.x>0&&p.push({instance:T[0],searchNode:o,x:-1,y:0,cost:c*m(o.x-1,o.y)}),x&&(o.x>0&&o.y>0&&(v||_(t,e,o.x,o.y-1)&&_(t,e,o.x-1,o.y))&&p.push({instance:T[0],searchNode:o,x:-1,y:-1,cost:l*m(o.x-1,o.y-1)}),o.x<t[0].length-1&&o.y<t.length-1&&(v||_(t,e,o.x,o.y+1)&&_(t,e,o.x+1,o.y))&&p.push({instance:T[0],searchNode:o,x:1,y:1,cost:l*m(o.x+1,o.y+1)}),o.x<t[0].length-1&&o.y>0&&(v||_(t,e,o.x,o.y-1)&&_(t,e,o.x+1,o.y))&&p.push({instance:T[0],searchNode:o,x:1,y:-1,cost:l*m(o.x+1,o.y-1)}),o.x>0&&o.y<t.length-1&&(v||_(t,e,o.x,o.y+1)&&_(t,e,o.x-1,o.y))&&p.push({instance:T[0],searchNode:o,x:-1,y:1,cost:l*m(o.x-1,o.y+1)}));for(var f=!1,d=0;d<p.length;d++)if(O(p[d].instance,p[d].searchNode,p[d].x,p[d].y,p[d].cost),p[d].instance.isDoneCalculating===!0){f=!0;break}f&&T.shift()}else{var s=T[0];s.callback(null),T.shift()}}};var O=function(n,o,r,i,s){var u=o.x+r,c=o.y+i;if(void 0===p[u+"_"+c]&&_(t,e,u,c,o)){var l=A(n,u,c,o,s);void 0===l.list?(l.list=a,n.openList.push(l)):o.costSoFar+s<l.costSoFar&&(l.costSoFar=o.costSoFar+s,l.parent=o,n.openList.updateItem(l))}},_=function(t,n,e,o,r){if(y[e+"_"+o]){var i=b(r.x-e,r.y-o),s=function(){for(var t=0;t<y[e+"_"+o].length;t++)if(y[e+"_"+o][t]===i)return!0;return!1};if(!s())return!1}for(var u=0;u<n.length;u++)if(t[o][e]===n[u])return!0;return!1},b=function(t,n){if(-1===n)return o.BOTTOM;if(-1===n)return o.BOTTOM_LEFT;if(0===n)return o.LEFT;if(1===n)return o.TOP_LEFT;if(1===n)return o.TOP;if(1===n)return o.TOP_RIGHT;if(0===n)return o.RIGHT;if(-1===n)return o.BOTTOM_RIGHT;throw new Error("These differences are not valid: "+t+", "+n)},m=function(n,e){return 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o?o.apply(n,r):o,!(void 0!==i&&(t.exports=i))}(this,function(){return e})}).call(this)}]);
\ No newline at end of file
diff --git a/bower.json b/bower.json
index 7c53922..20c8335 100644
--- a/bower.json
+++ b/bower.json
@@ -1,9 +1,9 @@
 {
   "name": "easystarjs",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "homepage": "https://github.com/prettymuchbryce/easystarjs",
   "description": "Asynchronous A* Pathfinding API",
-  "main": "./bin/easystar-0.3.0.min.js",
+  "main": "./bin/easystar-0.3.1.min.js",
   "keywords": [
     "A*",
     "pathfinding",
diff --git a/karma.conf.js b/karma.conf.js
index 388059b..5cb943c 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -20,7 +20,7 @@ module.exports = function(config) {
 
     // list of files / patterns to load in the browser
     files: [
-        './bin/easystar-0.3.0.js',
+        './bin/easystar-0.3.1.js',
         './test/easystartest.js'
     ],
 
diff --git a/package.json b/package.json
index 40c4999..7b8ebdf 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "easystarjs",
-    "version": "0.3.0",
+    "version": "0.3.1",
     "main": "./src/easystar.js",
     "typings": "./index.d.ts",
     "description": "Asynchronous A* Pathfinding API",