Short Description:

Tips must come in the chosen order to reach the goal (ascending: 1, 2, 3,... ; descending: 10, 9, 8,...)

Full Description

* How it works:
You set a value for your goal then members must tip in ascending order (1, then 2, etc) until they reach the goal, or in descending order (10, 9, 8, etc) until they reach 0.
The total of tokens needed to reach a goal is equal to: goal * (goal + 1 ) / 2
That means the total of tokens gets big VERY fast when you put a high goal.
Here are the total tokens needed for some goal values:
5 => 15
10 => 55
15 => 120
20 => 210
25 => 325
30 => 465
35 => 630
40 => 820
45 => 1035
50 => 1275
55 => 1540
60 => 1830
65 => 2145
70 => 2485
75 => 2850
80 => 3240
90 => 4095
95 => 4560
100 => 5050