Tidalis turns falling colored blocks into a puzzle about directing streams, and you can solve its challenges with a friend. You can share one board on the same computer, work on separate boards locally or online, or pick from three co-op rulesets designed around helping your partner. Its 115-level Adventure mode gives you a long trail of changing objectives, while timer-free Brainteasers offer a quieter way to untangle the same arrow-based system.
One puzzle, two ways to share it
On one computer, two people can play on a single board: one controls the mouse and the other uses the keyboard. You are both changing and triggering tiles in the same space, so this is more like passing control of a puzzle between two sets of hands than taking turns on separate screens. A shared board keeps the setup simple and lets a second person drop into a game already in progress, but only one stream can run at a time. The game also treats the board as one player, and this arrangement does not unlock the special co-op rulesets.
If each of you would rather have a board, Tidalis supports two-board local play on one computer. The mouse controls one board and the keyboard controls the other by default. You can change which input is assigned to each side, adjust each player’s handicap, and choose whether co-op items are enabled. Separate boards give you room to work at your own pace while still seeing what is happening on your partner’s side.
Network play also uses two boards, one on each computer, over a local network or the internet. The official setup uses two copies of the game, with one person hosting a private session and the other joining. Once connected, either player can choose a level, which the other accepts. A second person beside either network player can use that computer’s other input device, so two computers can accommodate up to four people altogether. Tidalis describes this as two-player network play because each computer contributes one board; those local keyboard partners are the extra seats.
Streams instead of swaps
Blocks arrive from the top of a grid, each marked with a color and a directional arrow. Instead of sliding or swapping neighboring pieces, you point a block’s arrow by dragging across it with the mouse, then launch a stream from a block. That stream follows matching colors in the directions their arrows point. When a chain reaches at least three blocks of the same color, those blocks clear. Blocks above the gap fall into place and can launch further streams, turning one well-aimed move into a cascade.
The system is easy to recognize after a few turns, but it asks for a different kind of attention than a conventional match-three puzzle. You are not just looking for adjacent colors. You are sketching a route through the board: which arrow needs to turn, where a stream can bend, and what may happen when the empty spaces close. A long chain can cross parts of the board that are not touching, and special blocks can change whether a path continues, redirects, or affects nearby pieces. Some cascades are satisfying because the board seemed to predict them; others unfold too quickly for you to follow every step.
Many action levels add pressure by steadily dropping blocks. If the stack rises past the board’s top, you lose, though a level may instead ask for a certain score, a number of cleared blocks, a target combo, or survival for a set time. Some goals ask you to remove particular colors while limiting the total number of clears. That makes it possible to have a promising chain and still need to stop it from solving the wrong problem. A few modes let you control the pace; others ask for quick reads as the board changes.
A campaign that keeps changing the rules
Adventure mode gives the puzzle a route through the strange land of Tidalis. Its map links 115 levels, and its lighthearted story introduces odd local creatures as you move from one challenge to another. The dialogue is deliberately peculiar, and the backgrounds shift between painterly landscapes and more unusual settings. Cutscenes add a thread between puzzles, but the level goals are what set the rhythm: one stop may ask you to clear blocks quickly, another to produce a specific chain, and another to handle new pieces or board effects.
The campaign starts with room to learn and increases the complexity over time. New special blocks and game styles alter familiar rules, while the board’s flow and a level’s target can change together. Blocks made of wood can interrupt a stream; other pieces react to matches or gravity in their own ways. The result is a campaign that keeps introducing wrinkles instead of asking you to repeat exactly the same clear-the-board task. You can skip a level that is giving you trouble and return to it later, which makes the route less of a hard stop when one puzzle refuses to click.
The separate Brainteasers menu changes the tempo more sharply. These puzzles have no timer, and nothing moves until you act. Many ask you to clear the board within a set number of moves, though the exact objective varies. When you play one together on separate boards, you each get the same starting puzzle. You can compare possible routes or test different moves, and revive your own board after a failed attempt without resetting your partner.
Quick Game and Custom Game let you step outside the campaign and choose the conditions for a match. You can combine a game style with special blocks, items, a board size, difficulty settings, and a time limit, or choose one of the ready-made variations. More than twenty styles and dozens of special pieces give the menus a lot to explore. A Zen-style setup removes the clock; a faster mode makes block drops more urgent; another can alter gravity or the way streams travel. Custom games can be tuned toward a slow logic puzzle or a busier arcade round, depending on the options you pick.
Three co-op rulesets make the boards interact
Co-op in the ordinary modes gives you the same broad task on two boards, with optional items that appear from time to time. Those items can only be used to help your partner, so an item can clear a dangerous piece or otherwise ease the pressure on the other board. You can leave them on for a little extra interaction or turn them off in player settings. Individual handicaps can also slow down a struggling player or make the other board more challenging, and can be adjusted between levels.
The dedicated rulesets are found in Quick Game or Custom Game after you have enabled two players. Sun or Moon asks you to clear sun and moon blocks in alternating order. Each player earns items corresponding to their own board’s special color and sends them across to make a partner’s next chain possible. The puzzle becomes a two-board exchange: your clear can set up the other person’s clear, and vice versa.
In Item Buddies, both boards receive extra helpful items, but you can use them only on your partner’s board. Block Vaporizer creates a more direct link: when you clear a chain, the game removes the most dangerous block of that color from your partner’s board, with one piece removed for every three blocks in your chain. Each ruleset changes what your move means to the other player. Clearing a long chain can be a favor, while a carefully timed item may rescue a partner whose board is about to fill.
These cooperative setups are distinct from the game’s versus modes. Garbage Battle sends troublesome blocks to an opponent after you make chains; Endurance steadily speeds up until somebody loses; Freeform lets you set other conditions. You can play head-to-head locally or over the network, but Tidalis also lets a solo board or two people sharing one board play against an AI. That flexibility gives the same core puzzle both a shared-goal version and a competitive one, so it is worth checking the player rules when you start a custom session.
The fit depends on your puzzle appetite
Tidalis is at its best for friends who like talking through a system while it changes under them. In a quiet brainteaser, you can compare a few routes and watch your partner try one without losing your own progress. In a dropping-block mode, the board may be less patient: one player can notice a path while the other is already rotating arrows to catch the stream. The game does not assign roles or give you separate character abilities. Your contribution is a read of the board, a move, or a useful item sent across.
The learning curve is the main thing to consider. The arrow-stream mechanic asks you to understand colors, direction, range, and falling blocks at once, and the range of special pieces adds more rules as the campaign progresses. Fans of puzzle games describe that layering as depth and variety. Other players find the stream effects hard to read, the click-and-drag input awkward, or some outcomes too dependent on which blocks appear. The campaign can also jump between relaxed puzzles and demanding levels. If your group wants immediate, obvious teamwork, the system may feel more like a dense puzzle to study than a breezy party game.
The story and presentation are similarly distinctive. Floating creatures, odd exchanges, painterly backgrounds, and music that reacts to how a board is going give the game a whimsical tone. Some players enjoy the unusual characters and soundtrack; others find the dialogue or repeated musical patterns distracting. Much of the story is delivered between levels, leaving the puzzle board itself as the focus of most of your time together.
What you need to play together
For a single-computer session, you can use one mouse and keyboard, with separate-board play available as well as two people sharing one board. For network co-op, plan on two computers and a copy of the game for each remote player; you can connect over a local network or the internet. The co-op input arrangements are built around mouse and keyboard, including a local keyboard player sharing a computer with a mouse player. If your group needs controllers, check their support before setting up a session.
Tidalis is available for Windows, macOS, and Linux. If your group uses a mix of operating systems, check that your particular combination can connect before arranging a network session. Online sessions include text chat, with no built-in voice chat. Tidalis offers host-and-join options and direct connection for network sessions, so you can arrange a match with a friend without depending on a random public opponent.
If you want a puzzle game where the shared board itself is the conversation, Tidalis gives you a compact local setup and a large set of rules to grow into. If you would rather solve the same problem on separate boards, its campaign, no-timer puzzles, and co-op-specific items give you several ways to make that work. Just expect the game to ask for patience with its arrows and moving blocks before every rule feels intuitive.