jellyBlocks()

Logic game were all colored blocks are controlled at once -- join all blocks of same color to win!

Implements a logic game, similar to "Jelly Blocks" and "Denki Blocks". Blocks move on a 2D grid with unmoveable black obstacles. The arrow keys move all unobstructed blocks by one unit, and blocks of the same color that touch are joined. The goal is to join all blocks of the same color.