Drill mode
Operators
Add / sub ranges
Operand A
to
Operand B
to
Mul / div ranges
Operand A
to
Operand B
to
Game type
Input mode
Discipline mode
Simulates real OA conditions — wrong answers lock in, backspace is penalized or blocked.
custom drills
Operand A
Operand B
Operand A
Operand B
Simulates real OA conditions — wrong answers lock in, backspace is penalized or blocked.