Lil' Monster is an RPG strongly inspired by Pokémon games, with a few key differences. The game takes place in a more linear world, where the player can select specific locations on a map to visit. The player's goal is to catch and train small monsters, which can be used for battling against other players or computer opponents.
The gameplay involves selecting the right monster for the battle, using its special command to attack or defend. The battles reward the player with experience points and gems, which can be used to level up their monsters and improve their abilities. In addition to battling, the player can also explore the game's world, visit towns, and buy or sell items.