I managed to solve the first level and the game tells me that it is successful, but when it returns to the level selection screen, the next level is not unlocked. Am I missing something obvious?

I'm getting this game if (i.e. as soon as) the timer becomes optional... I LOVE the 3D feature.

It would be good if the volume of the music and effects could be adjusted independently.

I can't verify this for certain, but it seems to me that some of the initial random setups for the levels are unsolvable. I was frustrated on Level 3 for the longest time until pressing the reset button a few times and noticing that the initial tile placement is seemingly random each time. I looked up whether it's possible for a random configuration of a 3x3 sliding puzzle is unsolvable and found this, so this might be something to implement if there isn't already logic in place for this: https://datawo...

Hi Artur, Nice Game, i'm enjoying my time with it, but can you please add a level restart button? When the game is played with the mouse only, it is a bit annoying having to reach for "Esc" key.