Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Last decent edition of this game.

The 4th edition of Gamma World used the AD&D; rules system essentially by that point. It works pretty well for the most part. The book has a lengthy section on advanced tools and weapons that can well-equip many a mutant.I recommend it, but it is NOT worth $40+ some sellers are pricing it at. These guys have some cojones trying to milk it for that much. I bought mine for $10 at a local game shop.