This game offers you an opportunity to improve your ability to estimate angles.
You can either play on your own or challenge a friend.
The closer you get to the target angle the more points you will score.
There are four levels:
Level $1: 0-90^\circ$
Level $2: 0-180^\circ$
Level $3: 0-270^\circ$
Level $4: 0-360^\circ$