Ruby MMO: massively multiplayer online programming challenge
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Ruby MMO

Ruby MMO is a programming challenge in which players compete to gain the highest level in an MMO simulation.

How to play

Fork this repo and commit a module inside the /players directory. The module is then used to extend a player object with a couple of methods:

  1. The move method returns an array with two elements: the method to be called (can be one of :attack or :rest), and the method arguments. In the case of :attack the argument should be an instance of an opponent Player (see below for how to get this). In the case of :rest no argument is required. See the examples in the /players directory.

  2. to_s (optional) returns the name of the player.

Order of Play

The player order is shuffled each round. If multiple players attack the same opponent, the attacks are grouped so that the largest group attacks first and then remaining attackers are random (thanks to @iyonius).

Levelling Up

For each conquered opponent, the attacker gains the amount of experience equal to the opponent's max health. Group attackers split the experience equally. If a player's experience crosses the threshold for levelling up, that player's max health, strength, and defence will all be increased (according to the schedule in engine/player.rb).


The player modules have access to the hash. This hash contains all the players and monsters in the world and their current stats. For example, to get the stats of a random player you could do:

player_count =[:players].count
opponent =[:players].select{|p|p != self}[rand(player_count - 1)]

The select is to ensure the player is not fighting itself.

There is also a method alive that returns false if the player is dead.


  1. No cheating by overriding classes, methods, or instance variables.
  2. Cheating players will be moved to the cheaters/ directory.

Running the simulation

./engine.rb -r 100 where -r sets the number of rounds (default is 10).


The player with the highest level and experience wins.


Sprint (./multi_run.rb -r 1000 -o 10)

*noob* won 342 times
Izidor won 224 times
strax won 210 times
Angry Mamay won 143 times
KurSe won 81 times

Race (./multi_run.rb -r 1000 -o 100)

Cossack Mamay won 191 times
South Pole Steve won 163 times
Jack won 160 times
Chuck Norris won 157 times
| Drowsy Leo | won 154 times
Izidor won 42 times
Eric the Kill Steal won 36 times
Sir Samsonite won 34 times
Jayaram won 24 times
*No rest for the wicked* won 10 times
Valentin won 7 times
*noob* won 6 times
Kabutomushi won 4 times
flipback won 3 times
Angry Mamay won 3 times
Michael won 2 times
Mighty Snuderl won 2 times
rots won 1 times
KurSe won 1 times

Endurance (./multi_run.rb -r 1000 -o 1000)

Chuck Norris won 199 times
Jack won 155 times
Cossack Mamay won 155 times
South Pole Steve won 154 times
| Drowsy Leo | won 117 times
Sir Samsonite won 92 times
Izidor won 39 times
Eric the Kill Steal won 22 times
Jayaram won 17 times
*No rest for the wicked* won 13 times
Angry Mamay won 9 times
Michael won 8 times
Valentin won 7 times
flipback won 5 times
*noob* won 4 times
Mighty Snuderl won 2 times
jimworm won 1 times
Kabutomushi won 1 times