Here is a (I believe not rare at all) sliding tile puzzle, I have replaced the stickers on it with white stickers for a 3x3x3.
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The number '6' and '9' won't be a problem when one is inverted as I always write my '9's with a straight tail, and I find it easy to tell the difference:
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This photo shows the 4 corners twisting simultaneously:
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The tracks that hold the tiles in place at the corners have only one straight line, not a cross, so tiles can't always go in or out depending on the orientation of the tracks, the following photo shows the orientation I have my tracks when the puzzle is solved:
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Here's a question, do you think it is possible to solve the puzzle into a position where all tiles are in place and correctly orientated, but the tracks are vertical rather than horizontal?
Also, any ideas on how to solve!?
P.S. Sorry of the twisted images caused anyone neck problems!