The game starts with one Bomb Gem on the board, set to 60 seconds or 20 moves, depending on which mode the player is playing. As the game wears on the bombs will be dropping more frequently, to the extent that they will drop after every move the player makes. At an arbitrary point the bombs start appearing with 45 seconds/15 moves. In the time-based version 30-second and 15-second bombs will eventually drop if the game is still ongoing, but mysteriously the equivalent doesn't happen in the move-based version (10 moves and 5 moves respectively). The time-based version contains Blazing Speed, which is useful for disarming hard-to-reach bombs. The game ends when a Bomb Gem ticks down to 0.