Open Doors and Open Doors 2, two Flash games by Ozzie Mercado (thanks to Keith Harrison for pointing them out to me), but plays quite differently because of the puzzle layout.
Let's see what the doors look like. Here is the first puzzle:
The fundamental thing to discover is that there are two ways to push a door, which are completely different and have profound effects on solving the puzzles.
The first way is the one seen above, where you push the door from the inside. This move is reversible: you can just walk back through the door, and both you and the door will return to your previous positions.
Soon enough, however, the first kind of move is no longer enough to solve the puzzles. Let's look at another one, and pay attention to the door in the top row:
Pushing doors from the outside, it's actually possible to get stuck into an unwinnable state; luckily, the game kindly informs you when that happens, so you can undo your mistake.
The free version has 168 puzzles in 3 difficulty levels, while the pro version has 480 puzzles in 4 difficulty levels. Interestingly, all the puzzles are played on the same 4x4 grid, with the only thing that changes being the number and position of the doors. The hardest puzzles have 8 doors and look like this:
To move, you simply tap a corner on the same row or column of your man to make him walk. This makes sense because your path can be very convoluted and pass through the same intersection multiple times, so drawing a path wouldn't have worked that well. Your man walk a bit slowly, but you can queue up all the commands needed and then just watch the solution undolf; no need to wait for a move to complete before doing the next.
My main criticism to the game is that it feels overcomplicated. The graphics, while nice, probably make it difficult to clearly understand the mechanics, and the user interface has a bit too many buttons and options, especially in the screen shown after solving a puzzle.
This is certainly not a game for casual players, because understanding its mechanics and taking advantage of them requires discipline. If you feel up to the task (and if you're reading this blog, you should), definitely take a look at it.
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