Being a person who stands very firmly on both sides of the fence, I say to all those who wonder 'can adventure games truly be 3D?' that it very much depends on the developer.
For example, very similar sentiments were expressed when Nintendo announced they'd make Zelda 3D, and it turned out great because they carefully thought through what they needed to do to make it work. More recently, Nintendo helped another studio take the Metroid series, a series that many felt would only work in 2D, changed the gameplay completely and yet kept it the same.
(For those of you who don't play consoles, Metroid was a 2D action/platformer with a very non-linear component - your character was plonked down on a map and new levels were unlocked, of a fashion, by gaining power-ups that gave you new abilities, such as the ability to roll through tight gaps, or blow open reinforced doors. The 3D version is a first-person shooter, with a similar map design, but with the addition of an auto-targeter to take focus away from shooting.)
Although I'm speaking blasphemy here, I'd like to see a new level design for DROD 3D that takes advantage of the dimensions offered to it. If you try and graft Dugan's onto a 3D game, it's not going to work as Dugan's is designed to be seen from overhead, as someone's already pointed out.
Matt
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