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Luigi's Mansion 3 - All Bosses + Secret Boss (2 Player)
Cuphead - All Bosses (2 Player)
Cuphead Switch - All Bosses (2 Player)
Cuphead - Expert Mode 2 Player | King Dice and Devil
Cuphead - All Bosses (2-Player)
Cuphead DLC - All Bosses (2 Player)
All Bosses in Super Smash Bros Ultimate - 2 Player Co-Op
2 Player Undertale speedruns are very good