This is not how to make an exp hack ( 255 round ) .
But this is how to create a 255 rounds room .
1. Bypass Game Guard and open Cheat Engine .
2. Create a room like Bomb Match ( Search And Destroy )
3. Choose Blackshot.exe
4. Change value type to byte .
5.First can the round .
6. Change the round and next scan the round .
7. Do it 3 times .
8. If you get result , change it to 255 .
9. Enjoy the game .