New exercises and first game.
Revert "New exercises and first game."

This reverts commit 443a0e7dc6a2899c64b4f3d16f9bed3fa1dc089b.
Revert "Revert "New exercises and first game.""

This reverts commit 0eb27b985978e2e0956b57c48dcef893bd5d29eb.
First game in progress.