Set different flow speeds for each level.

Signed-off-by: tungpham31 <tungpham31@gmail.com>
Make sure the game has solution.

Signed-off-by: tungpham31 <tungpham31@gmail.com>
Merge remote-tracking branch 'tpham/master'
Merge remote-tracking branch 'gedwards/master'
show coins and stuff in coins store