1. Create the level here
2. Put the exported level data(eg:"00023...00") into level1.dat or level2.dat
3. Playdate > Settings > System > Reboot to Data Disk
4. Then you can browse Playdate as a disk > open this folder: (PLAYDATE)X:\Data\user.xxxx.com.retro6502.minitank_demo\
5. Copy level1.dat or level2.dat here
6. The levels will be loaded as level1 and level2 after restart the game
