In Hero Blasters: Defense, you will directly control battles by merging square blocks. Their main function is to summon a team of adorable heroes. Waves of fierce monsters are trying to storm the fortress and destroy you. The peace of the people inside the city depends on you guarding it.

The legendary character fusion mechanic is the backbone of the entire game. Players can choose skills in a roguelike style. The heroes you have prepared in advance can enter battle. However, to evolve them into a different form, you should combine two identical warriors together. A stronger version of them will be created.