- The Prototype Motorcycles (/) seem to have a issue causing it to not spawn on the same day after the charges have been used up.
- They also seem to have a very low chance of even becoming the invention of the day.
- Patch 6.1.0 (2015-02-24): Tooltip updated.
- Hotfix (2014-11-12): Now only requires 6 of the inventions used (down from requiring all).
- Patch 6.0.2 (2014-10-14): Added.