Every seed builds one small mountain: open ground on top, caves inside. Run through it, put a time on it, pass the seed on.

0:00.00
PB N/A | WR N/A

The clock starts when you move. → run, Space jump, ↓ slide, or dive in the air. Jump again on a wall to kick off it. Land on round mobs; never touch spiky ones.

Turn your phone sideways for a bigger view.

Today's seed

    One course a day, the same for everyone. No time on it yet.

    Ghost

    Your seeds

      Seeds you finish show up here with your best time.

      Controls

      ← → or A D
      Run. Downhill speeds you up.
      Space ↑ W
      Jump. Hold for height. Against a wall in the air, jump again to kick off it. In a shaft, keep pressing jump and you bounce from wall to wall. Half a tile short of a ledge, you pull yourself up. A jump while running up a ramp goes higher.
      ↓ S or Shift
      Slide. A burst of speed that fits under low rock. Slide down a hill to build speed, then jump to carry it. Tapped in the air it is a dive: the jump is cancelled and you drop fast.
      R restart · N new seed · M sound · F full screen
      Gamepad
      Stick or d-pad to run, A to jump, B, X or right trigger to slide, Start to restart.

      How it works

      1. Pick a seed. Any word up to 12 letters or digits builds the same course for everyone, every time.
      2. Run it. Start to finish, no checkpoints. There is often more than one way through: a tunnel under a mob, stones over a pit. Round mobs can be landed on for a bounce. Touch a spiky mob or a spike and the run starts over with the clock at zero.
      3. Pass it on. Share the seed, or copy a replay code so a friend can race your ghost.
      4. Climb the ranking. On every course you score a point for each player you beat. One course a day is the same for everyone, and past days stay in the archive.

      About

      Seedrun is a small speedrun platformer. A seed is a word, and the word is the course: the game builds every level, shaft and mob from it, so the same seed is the same run for everyone. Every course is checked by a solver: it plays the whole course with every mob in play, and that run is replayed through the game's own rules, so no seed is impossible. Times on the board are replays that the game re-runs before showing them.