NeoQuest 3D
A secret NeoQuest game that can be reached in Skarl's castle in Meridell, by clicking on a flag on the wall. It is more of a flash game, and only earns you neopoints, no trophies or other prizes are given. There is a solution to the whole thing, which may be found on guides.
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By clicking on a banner behind Kayla's potion shop in Meridell castle, you can play Neoquest 3D. It's a Neoquest, but no, it's not in 3D. It's a choose your own adventure game. The solution can be found in guides.