CongoSky · the playable-physics wing
Games where the game is the simulation. Not fake-physics with a score on top — every one is wrapped around an engine that already computes reality.
Kerbal became a cult object because its rockets fly on real orbital mechanics — the physics wasn't the obstacle to the fun, the physics was the fun. SkyLab is that discipline across the whole estate: hold a galaxy together, tune a universe, thread a black hole. Where a model simplifies, the HUD confesses — and the rigorous proof is always one click away. Consistency, not proof.
The dark-matter problem you can lose. Newton's disk flies apart; hold the outer rotation curve flat with a budget of a₀ — G's acceleration scale.
engine · live algebraic-MOND, curve measured from the stars
▶ Play nowBuild the orbit. Circularize, transfer, gravity-assist to a target on a fuel budget — real patched-conic mechanics. The KSP rung.
engine · GPU leapfrog + WASM core (the Galaxy Sandbox)
See the live sandbox →A god-mode solar system. Fling in a rogue planet and watch three-body chaos eat the orbits — real sensitive dependence, not scripted.
engine · small-N mutual-gravity N-body
See the live sandbox →Fly a probe past a black hole. Skim the accretion disk; cross the ISCO at 6GM/c² and you're gone. The lensed image warps as you approach.
engine · Schwarzschild geodesic ray-marcher (being built)
The a₀ research hub →You have the knobs — expansion rate, dark energy, a₀, the matter budget. Find the narrow band that forms galaxies instead of recollapsing or blowing apart. Fine-tuning as a toy.
engine · Friedmann ODE under the live Cosmos renderer
Enter the Cosmos →Seed tiny density fluctuations and watch gravity comb them into the cosmic web of filaments and voids — Newton vs MOND, grown differently.
engine · QUMOND particle-mesh solver (CI-green offline)
The Virtual Collider →A puzzle over G's three parameter-free predictions from a single measured input — each checked against CODATA to published tolerance. The serious physics, made a game.
engine · live particle-bench + the RAR ladder
See the particle bench →Zoom the set forever with a landmark map — rendered in integer-only Q16.16, so it's bit-for-bit identical on any CPU or GPU. Beauty on a finished proof.
engine · deterministic integer kernel (CI-green)
Live in the Skunkworks →The game must never teach false physics to be fun. This is the whole reason SkyLab is worth building, and the thing every lying edutainment product violates.
Where the model is exact, the HUD says so. Where it's an approximation (algebraic-MOND on a disk is not the rigorous QUMOND field), the HUD says APPROXIMATE and one line of why. Where it's illustrative (the Cosmos's epoch motion), it says ILLUSTRATIVE and points at where the rigorous version lives.
Every lying edutainment product is one bug report away from being caught teaching nonsense. SkyLab can't be — because the simulation is the only content, and where it simplifies, it confesses. A model you can honestly break is the only kind worth trusting.