All rank tests
Earn ranks in many fields with AI grading. Prove your skills from grade 10 through first dan.
Logical thinking rank
Deduction, induction, syllogisms, propositional logic, sequences, and sets. Five-lesson prep course, 20 practice questions, and a 10-question mock exam.
Crane-and-turtle rank
A calculation puzzle about counting animals with different numbers of legs, such as cranes, turtles, and octopuses. Move up with consecutive correct answers!
Work-rate rank
Solve arithmetic puzzles about work speed and efficiency. Calculate logically how long several people working together will take.
Math and reasoning rank
A broad range of math puzzles involving sequences, sets, reasoning, and probability. A serious rank test for logical thinking.
Tax calculation rank
From consumption-tax calculations to bookkeeping-level topics. Prove useful everyday tax and accounting knowledge with a rank.
General knowledge rank
Measure broad knowledge of history, literature, science, and philosophy. A comprehensive test of knowledge coming soon.
Speed-reading rank
Read a passage within the time limit and answer its questions. From 200 characters at grade 10 to 1,800 at tenth dan; advance by answering all questions correctly.
Typing rank
Supports Japanese romanization and direct English input. Measure WPM and accuracy in 60 seconds across 19 levels from grade 10 to tenth dan.
Japanese history rank
Covers 20 eras from the Jomon period to today. Aim for consecutive correct answers on 10 four-choice questions per level, with SciCirc explanations after mistakes.
World history rank
From the ancient Near East to modern history, with cross-regional questions and source reading in a 200-question pool. Aim for tenth dan with consecutive correct answers.
Summarizing rank
Summarize a 300–800-character passage in 100 characters or fewer. AI grades key-point extraction, redundancy, factual errors, and coherence.
Argumentation rank
Write a 200–400-character essay on a prompt. AI grades logical consistency, evidence, resistance to counterarguments, and structure.
Book response rank
Explain a book as if you were teaching it to AI. Grading covers comprehension, communication, personal interpretation, and recommendation.
Observation rank
Read a scene and list your observations. AI grades depth, number, surface/deep observations, and ability to propose hypotheses.
Rebuttal rank
Counter AI's claim → respond to its counterargument → three rounds of dialogue. Grading covers issue recognition, evidence, responses, and manners.
Questioning rank
Only the answer is shown. Create three good questions from it. AI grades depth, originality, and distance from the answer.