What can be customized
Each player selects a starting car color and can discover additional wheels, antennas, and horns around the house. Firevolt describes these pieces as mix-and-match appearance and sound options rather than upgrades that change puzzle strength.
The Supporter Pack adds a separate car model and extra cosmetic choices, but the base game already places customization finds in its explorable spaces. Cosmetic ownership and campaign progress should therefore be considered separately.
Search efficiently
Inspect side shelves, alternate ramps, and reopened rooms when the main path gives you a new traversal tool. Search as a pair: one car can maintain the known route while the other checks a branch, reducing the chance that both players lose their orientation.
Return to the customization interface periodically so each driver can identify genuinely new wheels, antennas, or horn choices. That is more reliable than using an unofficial numerical checklist assembled from pre-release data.
Why this page is mixed
The customization categories are developer-confirmed. Exact part totals, names, and room-by-room locations were not comprehensively documented by Firevolt at the September 2 snapshot, and third-party lists still contained demo-derived or speculative details. This guide therefore avoids asserting an unsupported “all parts” count.