Mental 2x2 and 3x3 determinants for Cramer's rule and linear systems. 20 progressive levels.
Why this matters
Determinants tell you whether a system has a unique answer and show up in geometry (areas, volumes), physics, and computer graphics. Useful long after the exam.
Levels Cleared
0%
Group 1
Count Down
Score 100 in 57s
2x2 (1-5)
Reach Target
Reach 150 pts in 58s
2x2 (1-9)
Last Problems
Last for 18 problems
2x2 mixed (+/-5)
Last Time
Last for 43 seconds
2x2 mixed (+/-9)
Beat The Clock
Get 12 correct in 57s
2x2 mixed (+/-12)
Group 2
Count Down
Score 115 in 54s
2x2 mastery (+/-15)
Reach Target
Reach 173 pts in 56s
3x3 with full row of zeros
Last Problems
Last for 21 problems
3x3 with full column of zeros
Last Time
Last for 41 seconds
3x3 triangular (upper)
Beat The Clock
Get 14 correct in 54s
3x3 triangular (lower)
Group 3
Count Down
Score 130 in 51s
3x3 (1-4)
Reach Target
Reach 195 pts in 54s
3x3 (+/-4)
Last Problems
Last for 24 problems
3x3 sparse (+/-6)
Last Time
Last for 39 seconds
3x3 (+/-6)
Beat The Clock
Get 16 correct in 51s
3x3 mastery (+/-9)
Group 4
Last Problems
Last for 12 problems
2x2 realistic signed (no timer)
Last Problems
Last for 12 problems
2x2 realistic open (no timer)
Last Problems
Last for 12 problems
3x3 sparse realistic (no timer)
Last Problems
Last for 12 problems
3x3 triangular realistic (no timer)
Last Problems
Last for 12 problems
3x3 open challenge (no timer)