the sumo minigame is terrible, please for the love of god just change to "press the correct button when it shows up" or something. Dunno what kinda reflexes you expect people to have to be able to hit up 100 times in 1 milisecond and then suddenly stop but it's just too difficult for what you want it to be. Coupled with the fact that the oni's rarely even let me challenge them to begin with so there's no way to even practice to get better at it. So like i said either make it a prompt thing or full on button mash please.