Kirby's Star Stacker is a Tetris-like puzzle game for the GameBoy. There are different modes of play, such as Time Trial, Challenge, and Story Mode , but the basic idea of play remains the same: you must sandwich Star Blocks between two like Friend Blocks, either horizontally or vertically.
The game features various block types, including Star Blocks, which are essential for clearing other blocks. Sandwiching a Star Block between two Friend Blocks will clear them from the screen. You can also match two of each Friend Block to clear them, and any Star Blocks in-between will be removed as well. Additionally, Bomb Blocks can be cleared by sandwiching one in between two Friend Blocks, causing an explosion that removes all blocks in the same row.
Other block types include Hard Blocks, which must be cleared twice to remove from the screen. Clearing them once transforms them into ordinary Star Blocks, and they can then be removed normally. The game also features a chain system, where clearing blocks that clear other blocks rewards you with Kirby raining down Stars, filling gaps, and potentially completing rows.