When is a puzzle Not a puzzle? When the game forces something with zero notice. You get the elemental tiles, but you have no say which goes in the current slot. You're guaranteed to fail the first time while you figure out that the game is forcing the order in which the tiles get placed. Hire someone from The Room (iOS game) and give us some really neat puzzles.
Slightly more seriously.. the mechanism is seriously forced and totally unnatural. The least you could have done was add a subscript somewhere that the tiles were spelled to only be used in a certain order.