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A practice multiplayer project in Unity/C#. A simpler version of Overcooked.

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Kitchen Chaos

A simpler version of Overcooked, one level. Playable with keyboard and gamepad. Playable as a single player, local multiplayer (with gamepads) or over network.


Overview

The player is enclosed in a kitchen. Recipes are lining up. The player has to use correct ingredients to deliver a correct recipe. Vegetables and cheese have to be chopped, the meat has to be fried and everything has to be combined in a bun on a plate. The player has to deliver as many recipes as (s)he can before the level timer runs out. There is currently a limited selection of recipes available.


Gameplay

The gameplay is controlled by a simple state machine with four states:

  • WaitingToStart - the tutorial screen is displayed, overview of key bindings
  • CountdownToStart - after the player presses the interaction key, the countdown is triggered
  • GamePlayingTime - after the countdown finishes, the player can start interacting with kitchen objects and counters to create recipes
  • GameOver - after the level timer is finished, the total number of recipes delivered is displayed, along with the high score. The game can then be replayed.

Input system

The game uses the new Unity input system and currently supports keyboard and gamepads. I plan to implement touch screen as well.
Default controls:

  • keyboard: move with WASD/arrows, interact with E, alternative interact with F, pause with ESCAPE;
  • gamepad: move with the left analog stick, interact with A, alternative interact with X, pause with START.

Playing options

The game is playable as a single player game, or as a multiplayer with up to 4 players. Used Netcode for GameObjects to implement multiplayer.

  • used NetworkVariable and server/client RPCs for synching
  • players can create private or public lobbies
  • players can join public lobbies from a list of available lobbies or enter a lobby code to join a private lobby
  • players can change their player nick and color
  • appropriate messages are shown when the player disconnects, when the host disconnects, when the session is waiting for all players to start the game or when the session is loading/synching data
  • the game uses Relay for networking

Code

The game uses events, scriptable objects and state machines extensively. Since the states are very simple, I didn't bother with creating a separate state class for every state and instead I used a dictionary (for gameplay states) or switch statements (in super simple cases, for example when it comes to input). There is currently one case I plan to refactor from using a switch to at least using a dictionary (stove counter states).

Logic is nicely separated from visuals and from UI. I also used namespaces to make sure there are no unnecessary dependencies.

There are several singletons. I made sure there are a minimal number of them (3 so far), but I plan to refactor this by using a service locator pattern, to practice the use of the pattern and to prepare for what may come in the multiplayer implementation.

Saving system is using PlayerPrefs. Since this is just a practice project and the only things that are saved are key bindings, music/sound volume and high score, I don't think I should be using a more complicated system at this point.


TO DO

As of 15 April 2023:

  • HOT: currently if the player uses a gamepad, there is no way to type in the input fields -> implement an on-screen keyboard
  • design a few more levels with a few new recipes
  • BACKGLOG: instead of spawning plates on the plates counter right away, start with plates on several counters; player should be able to put ingredients directly on the plate if the plate is on the counter; player should be able to put ingredients in a bun even if the bun isn't on a plate; logic and input for boosting the player's movement.

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A practice multiplayer project in Unity/C#. A simpler version of Overcooked.

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