SWINGBY
A little off course? Try a little less power.
Send a probe past a planet and watch gravity bend its path. Miss the target, keep your aim, and make one small adjustment. There’s a quiet satisfaction in watching the next shot find its way home.
Four stages to find your orbit. Try gravity, twin planets, and stellar wind in the browser demo above. The free Windows game below has all 128 stages, Daily Challenge, and Endless mode.
A small change can take you somewhere new.
Collect the gold diamonds and reach the coral target. Later worlds add moving moons, stellar winds, mirrors, asteroid belts, magnetic fields, and black holes. Sometimes the path that works is the one that swings the long way around.
SWINGBY simulates gravity and interacting physical fields for players who enjoy experimenting with trajectories and solving spatial puzzles.
IN THE WINDOWS GAME
Campaign
128 stages across eight constellation worlds. Learn a new rule, experiment with it, then bring everything together in a constellation finale.
Daily Challenge
A different course each day, with local records and a streak to keep.
Endless
Five probes. How many destinations can you reach before they run out?
40 ship appearances and 100 achievements to unlock. Every ship uses the same flight physics.
Aiming is the whole idea.
Drag back and release to launch. Collect both diamonds and reach the target for all three stars. Your last aim stays in place after a miss.
Arrow keys / WASD adjust angle and power. Shift makes smaller changes. Enter launches; R retries.
Hold Space or F during flight to speed up. Esc pauses. Controller support and keyboard rebinding are available.
The rest of the solar system is below.
Download the free Windows 64-bit build, extract the whole folder, and run Swingby.exe. Godot and Steam do not need to be installed. Progress saves automatically on your PC.
English, Korean, Japanese, and Simplified Chinese. The Windows game follows your system language; the demo follows your browser language. You can change either in Settings.
Made by monitari
Solo developer. Discord: 모니타리. Made for Game Gauntlet SIM Jam; development began on October 24, 2026.
Godot and GodotSteam (MIT). IBM Plex (SIL OFL 1.1; CJK subsets renamed Swingby Sans).
Constellation figures: Stellarium team. Star data: HYG Database v4.1, David Nash / Astronexus. Adapted under CC BY-SA 4.0. Full notices, licenses, and adapted data are included in the Windows download. Ending quotations are attributed in the game.
AI use: AI tools were used for code, visuals, audio, and text, including translations. Visuals are drawn in code; music and sound effects are synthesized in code. Third-party software, fonts, and data are credited above.
Download
Install instructions
Windows 64-bit:
1. Download and extract the entire ZIP.
2. Run Swingby.exe from the extracted folder.
Godot and Steam do not need to be installed.
Your progress is saved automatically on your PC.
The browser demo includes four stages. Download the Windows version to experience all 128 campaign stages and additional game modes.
