What changes
Sequencing entry and exit
Spiral turns one passage into a commitment. Timing the return is the main problem.
FastStarting pace
18 × 11Board size
ExtremeDifficulty
Sequencing entry and exitMain skill
Rules
Rules for this mode
- A fixed winding barrier reshapes the board.
- Walls, blocks, and the tail end the run.
- A normal red ball adds 1 point and 1 growth section.
- The inside and outside connect through limited passages.
Tactics
Three useful decisions
- Plan the exit before crossing inward.
- Use the tail position to judge when a corridor is reusable.
- Leave a red ball if the return path will close.
Start
Opening plan
Trace the spiral before entering it. Do not go inside unless the same corridor will still be free when you need to leave.
Watch for
Common mistake
Treating the red ball as the end of the route and forgetting that the body must follow.
Practice
Use three runs for one change
Use the first run to learn the board. Repeat the same opening on the second run. On the third, change only the turn that caused the previous loss. This makes it easier to tell whether the problem was the route or the input.
Need the basics first?Read the control guide, then use the strategy page to improve route planning.
How to playStrategy