Daruma-san ga koronda (Daruma tumbled!) is a (traditional?) japanese game. I knew about it from a manga.
One person will turn his back against the others and will say "daruma-san ga koronda!" while others would attempt to sneak up to him, and will have to 'freeze' their movements at the "koronda" part. Anyone who moves at that point is out! One could go "daaaruuumaaa-saaaan gaaa
koronda!" and so on. XD The game would repeat until someone reaches him or if everyone is out.
I wonder who got to to say the line. Probably Ayu.
I think, from what I understand, in the end of the game, it seemed like all the dancers tumbled upon each other in a pile, lol.