The player moves on a grid and has to reach the goal. The goal is placed randomly, but the levels are saved on a server. When the player take steps, the tile behind you will go down one level. If the tile is at its lowest (lava) the player will not be able to cross it. The next player who starts the game (this doesn't have to be on the same computer) will load the level data and see the changes you have made. Items help you traverse lava.

Controls
Movement: Arrow keys
Item: ///