Revert "correcting indentation"

This reverts commit 5bef0d6d5ae919c9c6ba3c246f6501b1736c5cbe.
Revert "fixing indentation"

This reverts commit 85854326e82e36922eed4cb769866f98f99a82f5.
Revert "adaptive difficulty"

This reverts commit e44dc19dada6a346628d838fa9261cd1872f493e.