3 playsLineflow
A physics drawing sandbox. Draw a line, drop a rider on it, and watch where the slope takes them.
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12 playsAbout this game
Lineflow is a physics sandbox built around one idea: draw a line, put a rider on it, and see what happens. There is no level to beat and no score to chase, just a pencil, an empty canvas and a rider who goes exactly where the slope and the momentum take them. The satisfying part is getting it right. A track that looks fine as a drawing turns out to have a lip that launches the rider into the air, a dip too deep to climb back out of, or a join that throws them off the line altogether. You adjust it, press Play again and watch. Getting a long run to flow cleanly from one end to the other is the whole game, and it is far more absorbing than it sounds. The playback controls are what make it work. Run a track at anything from a tenth of normal speed to eight times faster, follow the rider with the camera or pull back to see the whole course, and add more riders to test the same line at once. A crash stops the clock and tells you so; one key puts everyone back on the start. It is by Trollen101, and it is the most open-ended thing on the site: part toy, part puzzle, and entirely about what you decide to build.
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How to play
Pick the pencil and draw a line on the canvas, then press Play to send the rider down it. Add or remove riders from the toolbar, choose Follow rider or Fit to track to control the camera, and set the playback speed anywhere from 0.1x to 8x. If the rider crashes, press R to restart. Clear track wipes the canvas; Controls & help lists every shortcut.