A Lemarchand's box is a mystical/mechanical device that acts as a door or a key to a door to another dimension appearing in horror stories by Clive Barker. Model by Destro2k.
Hellraiser Lemarchand Puzzle Box Papercraft

This game involves stacking colorful blocks and seeing who came keep them balanced! The blocks come in different shapes, so it takes a lot of skill to stack them without letting them fall. When you run out of blocks, take one from the middle of the tower and add that to the top. The player who causes the tower to fall loses the game. Play it by yourself, or with your friends for more excitement and thrills! You can also make up your own rules for extra fun, like requiring one of the colors on the block to touch a matching color on another block when you stack them together-Canon
Balance Game Papercraft - Block Tower

Canon brings you more fun Halloween papercraft projects like these beautiful sliding puzzles created by erico, Ayako Kishi & Yuki Ohsawa.

Halloween Sliding Puzzle Papercraft

Can you solve this third puzzle from Ninjatoes? The latest Laytoes' Challenge Puzzle is called "Time Flies."
Laytoes' Challenges Puzzle 003 - Time Flies Papercraft

I made a new Professor Layton-style puzzle, "Laundromat Layman": Luke has made a mess of the launderette and now he can't reach the exit anymore - unless you figure out where to place one extra washing machine...-Ninjatoes
Laytoes Challenge 002 Laundromat Layman Papercraft

In this sliding puzzle, the dog looks like he's playing with a ball! Slide the puzzle pieces as you like, and swap the red and blue ball around. If you use the large and small obstacle pieces, it takes 71 moves to exchange the balls! If you're finding it hard, start by practicing without the small obstacle piece-Canon

Dog Sliding Puzzle Papercraft 

Inspired by the Professor Layton games, Ninjajoes has created his own puzzle papercraft. Ready your puzzle-solving skills.

The Professor Layton games for the Nintendo DS are short, but fun.

So much fun in fact, that I got inspired to make my own "Professor Layton"-puzzle (although I haven't played all the games yet, so maybe a similar puzzle is already in one of the games, or maybe you saw a puzzle like this somewhere else already, making this one not much of a challenge anymore... ;o)-Ninjatoes
Professor Layton Puzzle Papercraft

This is a game in which you assemble seven puzzle pieces and have fun creating all different silhouette shapes. Can you make the shapes on the box, without peeking at the solutions? You could also make up your own silhouette shape and have fun with your family and friends trying to solve each other puzzle-Canon

Silhouette Puzzle Papercraft

Create your own classic cube puzzle, one of the most clever types of puzzle around, with paper! Fit the seven pieces together to form a cube, each face with a neat, checked pattern. The puzzle has 21 different solutions, but none of them are easy to come by! Method of play is simple yet addictive - why not give it a try?-Canon

Checkered Cube Puzzle Papercraft

Using a marble, try and see if you can reach the goal by getting past the windmills, slopes, and other obstacles .
3D Maze Papercraft

The Rubik's Cube is a 3-D mechanical puzzle invented in 1974 by Hungarian sculptor and professor of architecture Ernő Rubik. It was originally called the "Magic Cube." As of January 2009, 350 million cubes have sold worldwide making it the world's top-selling puzzle game.
Rubik's Cube Papercraft

Here's a puzzle composed of gear like parts wherein you put it together to form a cube.

Gear Cube Puzzle Papercraft