x.x is the author that has developed several Cave-style freeware shooters such as Blue Wish Resurrection Plus and Eden's Aegis for Windows PC. The first game release by x.x was Green Wind, a Mushihime-sama-ques shooter that uses the Tonyo System engine. After Eden's Edge, the third game release by x.x, abandons the Tonyo System engine and used a completely different game engine for Eden's Edge and afterward.

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