Length
5
10
20
30
40
50
100
Open
Level
2
3
4
5
6
7
8
9
10
11
12
13
14
15
20
50
100
Timer
None
Hide
0:30
1:00
2:00
3:00
4:00
5:00
10:00
20:00
30:00
Feedback
Off
On
1
2
3
4
Animate
No
Yes
Addition
Subtraction
Multiplication
Division
÷ USA
EU
Simple
Inverted
Long A
Long B
Triplet
Negatives
Parentheses
Absolute value
Focused
×10
×100
Make URL
See correct answer
Arithmetic
5 + 5
=
OK
Right
Wrong
Clock
<<
>>
Change answer
Math
Reset
Enter key or OK button finalizes answer.