That I'm the first person here writing a review, shows how overlooked this gem is. In my opinion Tumblestone even surpasses the most iconic puzzler of all time: Tetris. And there is one main reason for that: Scalability. What starts out as a fairly basic puzzler evolves into something more complex with each added modifier. After you mastered all the different puzzle variations (which can take quite a while), different modifiers can be combined to create some of the most demanding puzzles that can take over an hour to solve. After years of casually playing this game, I'm still improving. Tumblestone has such a long term learning curve, it's ridiculous. That speaks to the impressively well thought through game design. If you love Puzzle Games, get this game ASAP!