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Select a practice mode below. Your progress is saved to My Records after each test.
Count how many characters differ between the two strings.
When you are ready, press Start. The 15-second timer begins on question 1.
Pick the best approximate answer. Questions use the same types as the practice sets, with new numbers each test. You have 7 minutes.
When you are ready, press Start. You have 7 minutes for all 20 questions.
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20 questions, 6 minutes. Match each cube to the correct net (layout and symbol rotation).
When you are ready, press Start. You have 6 minutes for all 20 questions.
Cube unfold
Match the symbols on the visible faces to the correct net.
The cube view changes each round. Pick the net where symbols and their rotation match the cube.
Select your answer
20 questions, 6 minutes. Match each net to the correct assembled cube (symbols and rotation).
When you are ready, press Start. You have 6 minutes for all 20 questions.
Cube folding
The net shows how the cube unfolds. Pick the assembled cube with matching symbols and face rotation.
Symbol rotation on each net square must match the cube face you see from that angle.
Select your answer
Memorize a 6×6 grid for 3 minutes, then 5 math questions (10s each), then 20 recall questions in 6 minutes.
Press Start to begin the memorization phase.
Press Start to reveal the grid.
Memorize for 3 minutes, math 10s each, then 6 minutes for 20 recall questions.
Math distraction
Grid recall
Complete each number sequence. You have 6 minutes for all 20 questions — skip and return anytime.
You have a test in progress.
When you are ready, press Start. You have 6 minutes for all 20 questions.
Memorize the passage (3 min), then 5 math questions (10s each), then 15 recall questions (3 min).
One random briefing text is chosen each session. You cannot skip the memorization phase.
Memorize this text — no skipping
Math distraction — 10 seconds per question
Math distraction
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Correct 0 · Wrong 0 · Answered 0
3 minutes total — use the numbered buttons to jump between questions
Passage recall
Solve as many problems as you can in 90 seconds. Mix of +, −, ×, ÷.
You will get one problem at a time. Type your answer and press Enter to submit. Skip to move on without losing accuracy on the rest.
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Correct 0 · Wrong 0 · Skipped 0 · Total 0
20 trials — decide whether the two strings are the same or different. Faster is better.
Two short strings appear side by side. Click SAME if every character matches, or DIFFERENT if any character differs. There are 20 trials in total.
Keyboard: S = same, D = different
Tip: use S / D for faster reactions · 3 s per question
Name the ink color of the word as fast as you can. Ignore what the word says.
A colored word appears in the middle. Click the button that matches the ink color, not the word itself. Most trials are incongruent (the word and color disagree). 24 trials, 3 s each.
Keyboard: R red · B blue · G green · Y yellow · P purple
3 s per question — click or use the first letter of the color
Identify which candidate shape is the target rotated. Mirror images don't count.
You'll see a target shape and four candidates. Exactly one candidate is the target rotated (90°, 180°, or 270°). The others are different shapes. 15 trials, 8 s each.
Keyboard: 1–4 pick that choice
8 s per question — rotate the target in your mind to find the match
Progressive figural reasoning — sequences, Raven-style matrices, spatial paths, count logic, and attribute rules. Review explanations after each item.
You have 5 minutes for 15 puzzles. Modes: Standard, Review (easier pool), Daily challenge.
Question figures
Answer figures
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