The keystone in an arch bridge is the wedge-shaped center piece that is put in position at the very end of constructing the arch which causes the other pieces to stay in place.
| Game | Time | WPM | Accuracy |
|---|---|---|---|
| 2459 | 2018-06-06 18:31:43 | 62.13 | 97% |
| 2014 | 2018-04-10 16:00:14 | 54.72 | 97% |
| 1239 | 2017-11-07 16:50:48 | 48.12 | 98% |