March of the Boos is a portal defense game. Summon a spell from the surrounding torches to defend your portal against oncoming Boos. Destroying Boos with the spells will also charge your portal's energy, which can be triggered to launch powerful magic blasts that will wipeout all onscreen Boos and rekindle the torches!
Watch out for the golden Boos! Even though you'll hear them coming, they are extra fast and impervious to your portal's magic blasts. Destroying them will give you bonus points and help your portal recover health.