Ibb & Obb asks two players to trust each other with gravity. The green creature, ibb, and the pink creature, obb, move through a world split by a thin horizon line. On either side of that barrier, everything is inverted and gravity pulls in opposite directions. Neither creature can finish the trip alone.
Sparpweed Games developed and published the puzzle-platformer for the PlayStation 3 in 2013. It began as Richard Boeser’s graduation project and debuted at IndieCade in 2008. Codeglue handled a Microsoft Windows port that arrived in 2014. A Nintendo Switch version followed on March 5, 2020, and it was Sparpweed’s last release before the studio closed.
That is a long life for a small game about two blobs and a line.
Trailer, via sparpweed.
The Well of Lost Plots and the Missing Capitals
The names are deliberately lowercase. They come from Jasper Fforde’s book The Well of Lost Plots, where two “generics” named ibb and obb have to earn their capital letters by evolving as characters. Sparpweed took the joke and built a whole game around it. The two creatures start as nothing much. They end as something.
It is a clean idea, and the game never wastes it. The horizon line is not decoration. It is the rule set. Ibb walks on the top half of the screen, obb on the bottom, or the other way around, and each one’s floor is the other’s ceiling. Jumping for one is falling for the other. The screen is one image, but it is two worlds.
Two Players, One Screen, No Room for Freelancing
Cooperation is not a mode here. It is the whole machine. Ibb & Obb supports single player, multiplayer and co-operative play, but the design pushes hard toward two people at one screen. The two characters must work closely together to progress. A lever pulled on one side of the line opens a path on the other. A platform held in place up top becomes a landing spot down below.
The result is a game that punishes freelancing. One player who runs ahead does not get ahead. That player gets both of them stuck, or dropped, or reset. The genre labels — platform, puzzle, adventure, indie — all apply, but the puzzle is really the other person. Reading your partner’s next move matters more than reading the level.
This is where Ibb & Obb earns its keep. Side-view puzzle-platformers are common. Two-player ones that make the second player structurally necessary are not. The game does not offer a solo path as an afterthought and then pretend it counts. It builds the levels so that the two bodies are the answer.
A Short Running Order of What the Game Asks
The demands arrive in a rough order, and the order is the point:
- Learn that your floor is your partner’s ceiling, and stop fighting it.
- Learn to wait — the level will not move until both creatures are placed.
- Learn to talk, because the screen gives you no other channel.
- Learn to fall on purpose, since falling is travel for one of you.
- Learn to let the other player lead when the geometry favors them.
By the last step, the game has taught something most co-op games never bother with: that being carried is a skill.
Here is the shape of a session, roughly:
| Stage | What the pair faces | What it tests |
|---|---|---|
| Opening | Simple gaps across the horizon line | Basic movement and inversion |
| Early | Levers and held platforms | Timing between two players |
| Middle | Gravity flips mid-run | Communication under pressure |
| Late | Long chains of dependent moves | Patience and turn-taking |
| Final | Everything at once | Trust |
That table is not a level list. It is the arc the design follows, and it holds up.
Where the Line Gets in the Way
Ibb & Obb is not a long game, and it is not a generous one. The inverted-gravity trick is elegant, but it is also the only trick, and by the back half the levels are rearranging the same handful of ideas. The difficulty curve leans on precision rather than invention. A missed jump costs a reset, and resets cost momentum when you are playing with someone who is newer to the game.
The Switch release in 2020 gave the game a second life on a platform built for two people on a couch, which is the right home for it. That it was Sparpweed’s final release before closing gives the whole thing a bittersweet edge, though the game itself stays light. There is no story to speak of, no characters beyond the two creatures, no dialogue. The tone is bright and quiet.
That sparseness is a choice, and mostly a good one. Ibb & Obb does not need lore. It needs two players who will actually talk to each other.
The published critical score sits at 7.9 out of 10 across five outlets, and that number is about right. This is a smart, tightly built cooperative puzzle game with a genuinely original core mechanic and a short shelf life. It does one thing better than almost anything else in its genre, and it does not do much else. The single-player option exists, but it is not why anyone should play this.
What matters here is the horizon line. A thin barrier that inverts everything is a simple idea, and Ibb & Obb never lets it become a gimmick. It stays the rule. Every puzzle, every jump, every moment of two people yelling at one screen comes out of that one line and the fact that gravity disagrees with itself.
That is worth 7.9 of 10.
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