Tidalis is a block-based puzzle game with casual appeal, hardcore depth, and an addictive new "streams" mechanic. The basic rules of the game are this: blocks fall down into the board and have a color and an arrow direction. If a stack of blocks exceeds the height of the board, you lose. In order to clear blocks, you must right-click and drag paths through the arrows to set up chain reactions of like-colored blocks.
This game runs in trial mode until unlocked via a purchased license key. Trial mode disables some features, most notably: all the editors; custom games; player-created or standalone levels; quick games limited to 2 minutes each;; only the first 15 levels of adventure mode available; not all special blocks, game modes, and so forth are available.