Logic
62 problems
Solve a cryptarithm for each letter
Complete a magic square
Find the value each shape stands for
Find the unknown by working backwards
Set up the correct add/subtract equation
Sort objects by a given criterion
Classify by two criteria with a Venn diagram
Infer the hidden sorting rule
Chain attribute cards by one-attribute change
Common and different attributes of two groups
Deduce the hidden flipped cards
Insert plus and minus to make an equation
Deduce digits and place values from clues
Solve a table from given clues
Logic grid deduction table
Draw a table to solve
Find numbers meeting digit clues
Work backwards from the result
Recover hidden digits in a vertical sum
Cryptarithm digit deduction
Side length of a square from fitted figures
Multiplication cryptarithm
Multiplication synthesis challenge
Find unknowns satisfying multiple conditions
Find fractions meeting conditions
Find an object's weight from balance
Deduce weights from several balances
Find weights from mobile balance
Find the counterfeit coin by weighing
Order objects by weight from comparisons
Measure a target with unmarked jugs
Build a table to enumerate cases
Logic grid deduction table
Fill a table from conditions
Combine mixed data to complete a graph
Judge claims from a line graph
Cryptarithm: Letters Stand for Digits
Recover Erased Multiplication Digits
Capstone: grid-sum and remainder conditions
Find a number from division clues
Smallest number meeting remainder bounds
Find a number from layered conditions
Deduce stacking order from overlaps
Find the divisor from remainder clues
Cryptarithm: letters stand for digits
Recover erased digits in long multiplication
Find a fraction from sum and difference
Fill a bracket from win-loss clues
Move one matchstick to fix an equation
Final score after dropping highest and lowest
Insert parentheses to change the result
Solve using lines with equal sums
Which conditions force two triangles congruent
Complete a syllogism from two premises
Deduction table decides a one-to-one matching
Case-split on a hypothetical condition
Seat people from adjacency clues
Recover an answer key from scores
Exactly one statement is true
Truth-tellers and liars
Find a counterfeit of unknown weight
Find the lighter counterfeit coin