Kapsamon: Battle Royale is a game inspired by the Pokémon franchise and by the Battle Royale genre of games from recent years.
Multiple players compete online against each other to be the last one standing. Players take control of a human character who spawns in a random location in a wilderness full of kapsamons, creatures with elemental abilities which players can use to fight against each other.

Players start the game with a kapsamon at their side, but they can catch up to 5 additional wild kapsamons to add them to their team. One of your kapsamons, the active kapsamon, follows you and stays near you at all times.

Players can change their active kapsamon with another one in the party at will and switch control from the human to the kapsamon with the press of a button. The game’s camera stays locked to the human when the player is controlling their active kapsamon, so they cannot wander off too far from their human character.

When players find each other, they can use their kapsamons to fight. Players move around the map in real time to avoid enemy attacks while trying to hit them. Each kapsamon has 4 offensive moves that they can use, often in the form of a projectile.

These moves come in 8 different types (water, fire, plant, rock, electric, snow, ghost and heart), and each kapsamon also is one of those 8 types. Different types of moves can deal more or less damage to certain types of kapsamon, so adapting to the type of the opponent's kapsamon and its moves is key.

The first move of a kapsamon is always a simple, straight flying projectile of the same type as the kapsamon. The other 3 moves are chosen at random from a pool of attacks which varies depending on the kapsamon. If a kapsamon is hit by an attack, they lose Hp (even if the player is not controlling them).

If a kapsamon runs out of Hp, they are rendered permanently unusable but they remain in the party taking up a space for a kapsamon. The player’s active kapsamon will become another kapsamon in the party if the current active kapsamon runs out of Hp. If a player has no kapsamon in their party that are not at 0 Hp, they lose and disappear from the map.

A mass of poisonous fog that hurts kapsamons spreads over time from the edges of the map towards the center, to draw the players closer to each other.

When only one player remains that has not been eliminated, they win the match.