I'm looking for something simple that can be picked up quickly for my son and I. Will probably be repurposing 'Clix, Mon-Poc and other "scale" figures. Just looking to have a monster vs robot slug-fest that may or may not destroy buildings.
Being that I'm utilizing clix and other such figures, should indicate that I'm cheap. So free rules would be ideal, but super cheap for a pdf is also ok.
Any suggestions?