ibb & obb is a puzzle platformer for exactly two players. You and a friend guide the pink and green characters through a strange landscape split by a line, with gravity pulling away from that line on both sides. The Steam version supports online co-op and shared-screen local co-op, so you can play from separate computers or share one display. Every route is designed around the two characters helping one another: if your friend cannot reach a ledge, the answer may be for you to become part of the jump.
A line divides the level and connects it
The central boundary is both scenery and floor. Your character can walk along its upper surface, then pass through an opening and land on the underside, where gravity points the other way. White wavy portals let either character cross between sides. Some other portals are color-coded for one character, so the pink player and the green player do not always have the same route through a room. A puzzle can put a useful platform directly above your friend while the only way to reach it is to travel below the level first.
Falling through a portal carries momentum across the boundary. Drop from a high ledge on one side and you can emerge with enough force to rise toward a distant platform on the other. That gives a simple jump a longer arc: the launch, the fall, the portal, and the landing all belong to the same movement. The game does not hand you a separate gadget for every problem; it asks you to read the space, notice where gravity changes, and use a fall as the beginning of another jump.
The characters can also stand on each other. One can jump from the other’s head to gain extra height, while a well-timed jump from below can send both of you toward different ledges. Neither character has a distinct class or a weapon loadout, and the game does not divide your group into specialist jobs. The useful difference is often simply where each character is standing, which side of a barrier they can use, and who has the momentum needed for the next move.
That shared movement makes cooperation part of the platforming rather than a separate switch you turn on for certain rooms. One player may wait on a ledge while the other crosses a colored portal; then the first player uses the opening created on the far side. In another puzzle, both of you need to jump in sequence so the first character reaches a pad and the second catches the launch. The screen shows the same puzzle to both people, but each character can reach different pieces of it.
The game builds new puzzles from a small set of rules
The main journey contains 15 levels. It introduces ideas gradually, then mixes them instead of replacing the basic rules every few minutes. A pressure pad can open a passage or affect a jump. Gravity bubbles provide another pocket of altered movement; some let you float or carry a character to a place that is otherwise out of reach. Platforms and strange local creatures can become stepping stones or launch points. The game’s world map leads from one connected section into another, and its levels flow together without frequent breaks in the action.
Enemies add a physical obstacle to those movement problems. The black, spiky creatures have a vulnerable white side, which a character can reach by moving around the boundary. Some enemies stay in one place and can be dealt with from the opposite plane; others move or chase, turning a clean jump into a timed crossing. The threat remains small in scale, but it changes what would otherwise be a quiet exercise in lines and portals: a friend might need to wait until an enemy moves before a route is safe, or cross at the same moment you create an opening.
As the stages progress, the same mechanics demand more precise jumps and longer chains of movement. Early puzzles make the gravity flip easy to read. Later ones can ask you to carry momentum through several portals, move around a threat, and land on a narrow platform before your partner can continue. The challenge comes from timing and spatial reasoning together. A solution can be clear once you see the route, yet still take repeated attempts to carry out cleanly.
That curve matters when deciding whether the game fits. Later rooms demand increasingly precise jumps, and limited visibility can make some landings hard to judge. The most demanding rooms combine enemies, inverted movement, and small platforms. If your group mainly wants a relaxed platformer where one person can carry the other through tricky sections, this design may feel unforgiving; the game often expects both people to handle the same obstacle.
Hidden routes give the main levels detours
Eight secret worlds sit off the main path. Their entrances are hidden inside regular levels, so finding them adds a reason to inspect a familiar room from both sides of the boundary. The extra areas extend the same physics and teamwork, with harder platforming and collectibles to find. They are optional, but they make the world feel larger than a straight run through 15 stages and give a returning pair new places to search after the main route is familiar.
The main levels also hide gems and other bonuses. They are not needed to reach the end of a stage, but some sit in places that require you to use the gravity system in a more exact way. Collecting the reward can be its own small puzzle: one player holds a position while the other builds a jump, or both characters must reach a narrow space from opposite sides. The game does not turn those finds into a character build or equipment tree. Your progress is measured by the levels you have reached and the optional secrets you have uncovered, rather than by steadily improving statistics.
There is no broad roster of modes competing for your group’s attention. The central activity is a shared puzzle campaign, plus its secret areas and collectibles. That gives the game a clear shape: work through connected levels, learn how their geometry uses the two directions of gravity, and look for routes you missed. The same core rules keep returning, so replay value depends on whether your group enjoys mastering a fixed set of increasingly demanding puzzles or wants another chance to find a hidden entrance.
One screen or an online session
The game is for two players, not a larger party. Its local mode puts both characters on the same screen, with the boundary running through the play space instead of dividing the display into separate views. Online co-op lets a friend join from another computer. Steam Remote Play Together also lets one player stream the shared-screen mode from their computer. These are cooperative options for the same two-character journey; there is no competitive mode or extra teammate slot to fill.
The game supports full controller input and is available on Windows and SteamOS/Linux. Multiplayer supports cross-platform play, though not every supported operating-system pairing is specified. Keyboard input is also available on PC; one person can control both characters with a keyboard on PC, but doing so is difficult and does not replace a second player. If you are planning local play, check that your chosen combination of controller and keyboard works for both players on your setup. No bots fill an empty role, because the game has only two characters and is built around two people.
Online, connection quality can affect jumps that depend on timing. Remote Play Together streaming also depends on the connection between host and guest. If a jump feels less precise online than on the couch, the platforming makes that difference noticeable. The shared screen avoids a second machine, but it still needs two people and suitable controls.
A soft-looking world with demanding edges
The visual style is abstract and bright: rounded characters, clean platforms, softly colored backgrounds, and floating plants or cloud shapes. The same view can flip from a sunny upper surface to an upside-down route below it. That makes the world readable at a glance when the scenery is calm, while later effects such as darkness can make enemies and landing spots harder to pick out. The mood stays playful, but the obstacles do not always stay gentle.
Each level has music by Kettel, whose warm electronic soundtrack gives the quiet spaces a steady pulse. Sound effects mark movement through the gravity fields, adding a little lift to a fall that turns into an upward launch. There is very little spoken dialogue or narrative explanation to interrupt the puzzle solving. The game leaves its two characters mostly as expressive shapes and lets the changing geometry provide the story of a level.
ibb & obb makes the clearest sense when you and a friend want a two-person puzzle campaign where both players stay involved. Its basic controls are straightforward, but that simplicity leads into careful platforming rather than an easygoing stroll. The main route is finite, with eight optional hidden areas for groups who want more to uncover. You can play beside one another or online, and the same gravity trick keeps giving you new combinations to think through. The tradeoff is that later rooms can be exacting, and your friend’s timing matters as much as your own.