123 Boom operates on a 5-reel and 4-row grid layout delivering 1024 ways to win through innovative mechanics. The slot slider mechanism allows symbols to move in different directions, such as right to left in slide spin, creating flexible and dynamic winning combinations during base gameplay.

Triggering the main feature requires landing 3 or more cannon scatter symbols on the reels to activate free spins. During this bonus round, multipliers boost payouts and help players target the top potential prizes offered by the game.