Today's PUZZLE CLASSIC OF THE DAY
PREVIOUS 12 DAYS
Squares in a Grid: How Many?
How many squares are in the grid? Click a square => "Count" button.
Triangles in Pentagon: How Many?
A 5-pointed star is inscribed into a regular pentagon. How many triangles can you find in it? Select a triangle and click "Count" button.
Removing Openings
This wooden slab, 8'x12', has 3 square holes in it. Cut it into two identical pieces which, when rearranged, would create a slab 9'x10' without any holes in it.
Triangles in Triangle: Part 2
How many triangles are in this shape?
Triangles in Triangle: Part 1
How many triangles are in this shape?
Stellar Orbits
Place digits 1-6 in the six intersections so that the digits on each orbit would add up to 14.
Right Triangles in the Square
How many right triangles are in this square?
L-Shape to Square Frame
Cut this shape into two pieces which, when rearranged, can produce a perfect square frame.
Diamond: Counting Triangles
How many triangles can you count in this diamond?
Drawing Balls
A bag contains either a red ball or a blue ball. A red ball is then dropped into the bag, so now it has 2 balls. A drawing is held, and a red ball is drawn out of the bag. What’s the probability of the remaining ball also being red?
How Many Regular Hexagons?
How many regular hexagons are engraved on this stone? The biggest one is already counted toward the overall pool.
A Crystal
Place the numbers 1-12, sans 9, into the "atoms" of this crystal lattice so that each row totals 20. Two additional numbers are already placed in it - 5 and 15.