Memorisation time: 5 minutes (national), 30 minutes (international & WMC)
Recall time: 15 minutes (national), 60 minutes (international & WMC)
To memorise and recall as many binary digits as possible.
Complete row: 30
One error in row: 15
Two errors in row: 0
Blank row: 0
Last row (all correct): Number of the digits
Last row (one error): Number of digits divided by 2
Last row (two errors): 0
The best scores from the two attempts counts.