Playing bittos+ is very straightforward. On the game's 10×10 grid, you place a series of blocks made of bits that will be familiar to anyone who has played Tetris. Create 2×2, 2×3 or 3×3 boxes out of these blocks of bits, called bittos, to begin a reaction that results in the bittos' explosion. It sounds a little awkward in words, but its quite simple in execution.
If one of your bittos leaves a lone bit behind, it solidifies into a red bit, which can only be removed from the gameboard by having a bittos explode adjacent to it. In later levels, the board begins littered with red bits, upping the challenge by leaving less room to begin creating your bittos.