Mickey's Adventures in Numberland
About 40 Minutes to complete (while also pausing to write things for this guide), so it could be less.

All-Star
Collect four or more stars in a single level (advanced or super advanced)
5 PTS
5 RP
Unknown
By Jamiras •
View on RA.org
Not sure really how the explosive things work but they seem progressive like you have to get one in order for the next one to show up in a future area. I did not get this on my first run of the game but easily got it in Numberland City 1 on my second playthrough.
Numberland City 1
- Collect Number 1
Numberland City 2
- Collect Number 2
Space Center 1
- Collect Number 5
Space Center 2
- Collect Number 6
Museum 1
- Collect number 7
- Pretty easy for damageless level
Museum 2
- Collect number 8
Numberland Factory 1
- Collect number 3
Numberland Factory 2
- Collect number 4
- Must beat numberland factory to get path to Pete's Hideout
Pete's Hideout 1
- Collect number 9
Pete's Hideout 2
- Collect number 10