Logic Problems:

Writing Contest Winners

Grid-based Logic

Four high school friends loved to write and at their teacher's suggestion they entered a regional writing contest. Each of them entered a story in a different category. To their surprise and delight, all four of them...

BRYLine:

Expert 2

Logic: Shapes & Colors

Fill out all the cells in the line with the nine colored shapes, one shape per cell, in accordance with the clues

Geomatrix:

Beginner 5

Geometry & Deduction

Discover which one of the four dots surrounding a given letter is in fact the real one so that when all dots are assigned, all the clues are satisfied

Cut-Outs:

The Pinned FlexiSquare

DIY, Hands-on

Cut out the square ring the U-shaped cut in the middle of it. Pin it to the table through the small central dot...

Matchsticks:

The Pyramid

Segment-based geometry, hands-on

The Pyramid is built of 15 squares. What is the minimum number of matchsticks to be removed so that…

Puzzle Stories:

The Webmaster Algebra

Deduction, Reasoning, Spatial

A webmaster looked at the ad revenues at his website. The account showed “Today’s Earnings” as $0.01, “Yesterday’s Earnings” as $1.33, and “This Month’s Earnings” as X...

Kolocells:

Beginner 2

Logic: Colors

An arrangement is composed of an even number of circles. Paint each circle in one of the three prime colors in accordance with the clues provided