Excellent game that provides a very engaging experience. I particularly liked how the text frequently provided hints on what to do next, so there was never a time where I felt clueless. My only gripe is that the text is quite small and can be hard to read sometimes (at least for me), so it would be great if there was an option to increase the font size.
If an item is currently equipped, there shouldn't be an option to sell it in the market. Otherwise people might accidentally sell off their equipment thinking they were spares.
Showing the possible combinations for each box makes the whole idea of the mathematical operators pointless. You can just view the combinations and play it like regular sudoku without having to do any math.
We believe almost every player tried that on every combination minigame on the whole site. We did it too.