Two characters each. Every round, secretly pick one ability and one equip, or swap. Water beats Fire, Fire beats Ice, Ice beats Water.
Hand the phone over. No peeking at their pick!
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Winning element hits for 25. Same element: both take 25.
Sword adds 5. A shield blocks the sword and takes 2 off the ability hit.
Swapping in takes the full hit that round. Knocked-out characters are replaced for free.
Specials (once per character, whole turn): a Special Move hits for 40 through shields and swaps. Pick one ability with it as a guard: if it beats their ability you only take their sword.
A Special Defence blocks everything. Against a Special Move it still takes 15.