Shadow Tactics: Blades of the Shogun should run on fairly modest rigs and is very cheap atm. Good stealth strategy homage to games like the Commandos series and some people seem to say it's better than Desperados 3, which followed it.

Downwell could run on a casio watch and is available for pennies, if you're talking really low spec. Great little shooter, especially once you figure out how to keep the combo going (the knack is that you're supposed to try to never touch a surface, just bounce on enemy heads and breakables while buying float time with the recoil).

Shadow Tactics: Blades of the Shogun should run on fairly modest rigs and is very cheap atm. Good stealth strategy homage to games like the Commandos series and some people seem to say it's better than Desperadoes 3, which followed it.

Downwell could run on a casio watch and is available for pennies, if you're talking really low spec. Great little shooter, especially once you figure out how to keep the combo going (the knack is that you're supposed to try to never touch a surface, just bounce on enemy heads and breakables while buying float time with the recoil).