I made 10 tracks that all use 3 blocks only, a start, checkpoint, and finish. each track varies in time from 2 to 10 seconds and have a range of difficulties but none are too hard, here they are.
1. PolyTrack14pdBBvkCACCFAA8QlLqlPfNTlItQsdJYWUYRg3fNTw0haCcnq0OPG5q3HG2tJj1iNprIXYSIAyFTm2pMp6zQO1x8AmYwGqPkxeWfFfVAA3deRP8zCBkBr
2. PolyTrack14p9i0XLNx4IdLYvzziQ8PJ38ug8d1pgT01kKNvgS1nSNJ4ID0d3d0ZXdxzUTL10ACKLfFXpnesUfWuvuEoj5Wunu6f0NtK390fF7UuezRPL0YfmujAoPI3IY
3. PolyTrack14pdBBHtCABDFAA9fES849y2NZXMzLbvRhk2o0S5r35Y5ysUr00GKm6Xkt3XC0MzLxw4qKmZsaic7IJOxGY0JFDkNgkri38gX9xvim4DeoWz6EAyfhVdwPgKxfGIB
4. PolyTrack14p9i0XLNx4IdLYvzziQ8PJ38ug8d1pgT05kKNvgS1nSNJ4IDM308wzAD09ITPj0c3zSyviK90l0ds4y9NSvd3C3dOiUdMXD8wzkd0JHNJicDMUfAAgIi1IU
5. PolyTrack14p9i0XLNx4IdLYvzziQ8PJ38ug8d1pgT07kKNvgS1nSNJ4IDM30MLNggASLq0dy9U9IdDysSvzyxoqw5QKucHdNdvS30K90l0zPy09z9M80zQ8tcHds4c9Mg8DAA39lHzD
6. PolyTrack14p9i0XLNx4IdLYvzziQ8PJ38ug8d1pgT09kKNvgS1nSNJ4IDM3ySNNggyMx3yd0l0cLwEDKqcCydHdJSndOHvC0kK9OySL2pMcJCHN1RHDskQSr80cCA8iFHxB
7. PolyTrack14p9i0XLNx4IdLYvzziQ8PJ38ug8d1pgT0fJVaeCKVfUqJBHZg5mmJpBEUWe9tcHdJ9CiKngSv4IT3r0DscHDxxqyJIPTOqsCyTndObXcsQnMzlqcBAa2PHgB
8. PolyTrack14p9i0XLNx4IdLYvzziQ8PJ38ug8d1pgT0pkKNvgS1nSNJ4IDM30MJNggyy33yd0l083zEDPqsdKQHzNSn91NXK2pM8xFfWhzukrjZ4VSpnjTOGcVZ6hJeAA1jZHRA
9. PolyTrack14p9i0XLNx4IdLYvzziQ8PJ38ug8d1pgT0rkKNvgS1nSNJ4IDM30MJNggyK33yd0l0z3tcCzdnqMTnyNys9ydHdxXn8NC3N1RfGhRR6amp7opO6YxuHVAlHAAmYqOkA
10. PolyTrack14pdFHH0DABCGAA9PVMO2Xr0Gtm4SuxWStms1IevHvbPtomm1sh29qR5Cr9IShh5IkKMinLkrbDmMh1fYBoRj42oPosJq9bOIjXJuOuIT0nGvK7uheSMmX3QKhXsl8jMB