Hungry Sumo

The player controls the growth rate of a jolly round sumo wrestler floating
around a zero-gravity ring by directing the mouse over the wrestler. But
nothing is this easy: other, competing wrestlers are also present in the ring,
all bouncing around uncontrollably, movements dictated according to the
physics of ancient ball-and-paddle games. Upon colliding with rival wrestlers,
depending on the flavour of the opponent (including ninja, statue, demonic and
poison imp sumo wrestlers) both parties generally diminish in size, among
other effects. Players must thus grow their sumo continually, as wrestlers
shrinking below a certain size turn into the same type of wrestler as their
opponent. Here’s the big twist: players must _stop_ growing their wrestler
when bouncing into contact with another wrestler, which immediately turns the
player’s wrestler into the same kind as their opponent. Gameplay is entirely a
matter of this starting and stopping; levels are won when all offensive
opponents have been neutralized and turned into small hungry sumo wrestlers.