* Build you own puzzles. * Drag and drop directly from a website. * Play one of millions of auto-generated puzzles available. * Error detection helps you focus on te real challenge. * Pause your game at anytime during gameplay. * See your position in the records chart while you play. * Join a competitive multiplayer match. * Built-in live chat. * Save and load your games. * Play in multiplayer cooperative mode. * Unlimited undos and redos. * And many other great features.