[Darmani]

Prototype. Make a pen-and-paper version, pantomime the game, tell the story -- do something to test the game's excitement power before building it.

http://www.pathsensitive.com/2015/10/the-prototype-stereotyp...

[king_phil]

Not sure if angry birds would have made a great pen & paper game ;-)

[wastedhours]

Nope, but a box of Jenga and some small stuffed toys would suffice ;) (And actually, my brother and I played a paper version of Worms when we were kids - with the map drawn in pen, and our movements and attacks plotted in pencil - was fun)