Players can work together to solve puzzles in either multi well play or a share well scenario. Different power ups can be used to assist your partner to complete the level.
More Info @ PCGamingWiki
The "streams" mechanic employed by Tidalis is what makes it so unique -- chain reactions with a dozen blocks are trivially easy to create. This makes the game really easy to get into, but also makes the creation of advanced multi-stage combos more challenging than in other block-based puzzlers. At an advanced level of play, it’s the difference between Chess and Checkers; with Tidalis in the hands of an expert, there are more variables to keep in mind as you set up truly elegant interactions.
But never fear: the easier difficulty levels are quite relaxed, and our Zen mode provides a particularly no-rush style of gameplay. The core mechanics are so simple that the two-year-old daughter of one of our staff enjoys playing along with him. And we suppose it goes without saying that many of our mothers are hooked on it, too.
Whether you’re just looking for a casual fun time, a deep and strategic puzzle experience, or a series of brain-bending puzzles, we’ve got you covered. About half of the five staff members working on this game are the hardcore puzzle types, and the other half have completely casual tastes. We’ve approached this with our usual attention to detail: the mechanics of the timing, chain merging, and other mechanics have been refined to a ridiculous degree to provide an optimal experience in all play styles. [ARCEN]