An addition of
Hours + Minutes + seconds
give an even or odd number.
Match 2 Times with an even number as sum.
Example
Time:12:07:20
12+07+20 = 39
39 is an odd number
an could be match only with an odd number
All the transaction in this game will be done with the time. You can change time to lives or to get more moves.
This app offer the possibility the buy time as in app purchase.