Monster Smash is a medieval take on the popular "Whack-a-mole" concept where players control a Prince trying to rescue his beloved Princess Kate. Players progress through the game by shooting their way through an onslaught of enemies until they can reach and face off against the Orc King. Players have to race against the clock and fill up their blue "monster" meter by shooting enough monsters before their "health" meter runs out. Shooting the Princess, being hit by a projectile, or triggering poison will all also take away from the player's "health" meter. However, shooting fruit or various other power-ups will add to the player's "health" meter and to their score. The game features adjustable controls, an innovative combo system, 10 different power-ups, 50 different levels, and the ability to unlock 80 different achievements.