This game is simple. To play, you must lose. To lose, you must play.
Anyway, how to actually play is simple.
Poster 1 must present how to win.
Poster 2 must use how to win to make a way to lose.
Example:
P1: To win you must avoid the spikes and obtain the apple!
P2: To lose you must run headfirst into the spikes!
and so on
I'll start.
To win, you must find the holy grail and give it to the King!