Lisbon based Imaginatr has set all of their successful Cubimon puzzle series titles for free this Halloween. Designed especially for the iPhone and iPad, Cubimon and Cubimon HD are simple and funny puzzle games. The game consists of a moving square matrix and you need to align elements with the same color together to clear space. If you are not quick enough and run out of space you loose the game. If you like challenging, speed combination puzzle games, you will enjoy Cubimon.