This also makes health upgrades some of the most valuable upgrades in the game, so focus on those first. (cheatcc.com)
The challenges aren't difficult and you'll get most through normal gameplay, and the perks points awarded can be redeemed for skills such as health upgrades and other cool new abilities. (thedigitalfix.com)
If anything, side missions should have better incentives like health upgrades. (dualpixels.com)