-----Include---------------

1 bird,
4 little monsters,
3 map colors,
Randomly generate map nodes,
Game record (highest, current)
Little monster talks at random

-----Features---------------

Touch jump flight,
Touch requires advance prediction (height and time),
Different map block lengths, better random,
The little monsters in the map chat randomly and need to eliminate interference,

-----Purpose---------------

Leisure and entertainment,
Training response time,
Improve dynamic vision,
Train the thinking of prediction in advance,

-----Update---------------

March 31, 2020
　Google play, where it's called "downtunnel"
　　
　April 4, 2020
　　Add leaderboard