Importing custom tracks in Poly Track allows you to race on community-created maps by pasting a specific string of text (the "import code") into the game's track editor.  How to Import a Track Code 

The community frequently shares highly rated and "impossible" challenge tracks through these codes: Amethyst Skyscraper

• Toys & hobby models → HS 9503.00 (Duty-free in most developed nations).
• Industrial guide rails → HS 3926.90 (Dutiable, subject to plastics tariffs).

8426 / 8429 — Parts for mechanical handling equipment or for machinery (if tracks are parts of tracked vehicles or machinery).

7. Final Verdict

Poly Track import codes are not one-size-fits-all. The correct HS code (usually 3926.90 or 3918.90) depends on construction (interlocking vs. sheet), reinforcement, and intended use. Most portable event/construction tracks fall under 3926.90 at 3.5–6.5% duty, but permanent sports surfaces use 3918.90 with potentially higher rates.

Race: The new track will appear in your list of playable levels. Where to Find Track Codes