In this game, nothing remains after we get gems. That’s why it’s hard to practice All Gems. To solve this problem, we need to make loading save data possible.

Progress is saved in the registry. (There is a description in the thread of steam.) The path is

HKEY_USERS(DEPENDS ON THE PC)\SOFTWARE\Nitrome\BombChicken

If you export the registry data, all progress except acquisition status of gems is loaded. But some information, such as the acquisition status of gems, isn’t loaded. This is unknown where is saved. So, follow the steps below before practice for each stage.

1. Erase save data and quit the game.
2. Import registry saved in advance.

Starting the game, it starts from the stage on the way with no jems. It’s useful for practice for latter stages that isn’t easy to do, I think.

Sorry if my English is not good.