TR4 (Last Revelation) is easier to save supplies on then the last three TRs. Heres the hint to do it... 1.Save often. And try your best to explore everywhere and get through traps with few casualties. This will help save medipacks and get you items. 2.Look at the number of enimies your facing before you engage them. If it is one, and you are in a good-spaced area, use the pistols instead. Only use powerful guns when extremly needed, and better guns when you are facing difficult or more than one enmies. This will help save ammo. 3. Last, enimies usually can't climb... So take advantage of that. Get to an availble ledge and pick off the opposition with your pistols. Hope this helps you with the game.