Certainly, DROD has walls, doors and switches. Doors and switches do serve similar purposes to other games.
Or do they? How many other games can you get up on top of a door and use it as high ground? And, of course, few games use doors in the comprehensive way that DROD does - they can be used as barriers, sure, but they can also be used as traps, to build mazes, all sorts of things.
And walls, well, you need to put barriers some way.
Our objection to movable blocks is based around their uniqueness. Look at it the other way - can you make puzzles using pushable blocks which haven't been done before in everything from Sokoban to Zelda? There was an iron block idea I saw floating around that I liked, where you'd have magnetic orbs, or maybe just regular orbs, and striking one would send the iron block flying away from or towards the orb. Much like one of those sokoban puzzles on an ice floor where the blocks keep sliding. But think of what else you could do - it can be a trap; if your sword's pointing the wrong way you get a face-full of iron block. It's a weapon of mass destruction, as you could use it to slay a whole load of roaches all at once.
What kind of puzzle could you do with a pushable block that you couldn't do in another game?
Matt
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