Cursor 10

[Vipershark]

uh
that's how you beat the game
you sacrifice a cursor to hold that switch

then you use 3 more on the 15th floor to hold the three switches
your last cursor (or at least the one you beat the game with) should be the one right after the third switch unless you're going for points

you have to hold all 4 switches to open the stairs to the roof