If you like checkers and sudoku than you would fall in love with this puzzle! At first it might seem that it's a piece of pie game, any child can do that. But just wait until u'd pass all unlocked levels and your Nozoku addiction would kick in to go further. At this point developers reserved a trick for ya, you have to earn stars to unlock other levels. Whaaat?! So you start researching how to do it, and no, you don't have to upgrade or pay anything. You just have to use your brain! Tutorial doesn't really make it clear how to unlock, so you just need to start again and this time try not to leave any blank tiles behind. Once you achieve to do so you'll start earning stars per each level and therefore unlocking more and more levels! And suddenly you realize that this game isn't as easy as it seemed before, it becomes more challenging when you try not to leave any blanks behind. Good job developers! There should be more puzzles like this!

For anyone that missed it in the tutorial, you only earn a star in the level if you annihilate all the numbers and *all but the last* space. This could be explained better in the tutorial or it could be made more visible in the grid. For example, they could highlight remaining spaces and add a note when you get a check mark to try to leave 1 space only, to star the level. Anyway I enjoyed the challenge of figuring out how to star them all. I'd say level 37 was the trickiest but don't give up because I've confirmed all are possible. The graphics, sound and look of the game are very mesmerizing. I give it 5 stars. I hope they are thinking of adding packs with more levels and more cool squares like the duplicators and portals.

At first this game seems too easy but in order to unlock more levels, you need to earn a certain amount of stars. The game becomes much more challenging when trying to get a star on each level (meaning there is only one square left). The updated tutorial makes it clearer how to do this. Good fun!

Very addicting, engaging, and challenging! Suggestion would be to make it clearer in the instruction about how to earn stars. Many of us needed to go back tutorial numerous times to figure it out. Also there were no explanations for the additional symbols that occur in later levels. Other than that, great fun! Thanks developers!!