To make the game a bit more challenging an less predictable add a little
bit of randomness to the `dy` value. When hitting the right wall add a random
number (one of [-1, 0, 1]) to the `dy` value.
To keep the difficulty level managable limit the dy value to be in the
range from -5 to 5.
main
Reinhold Gschweicher2021-10-30 22:25:42 +07:00committed byJF