Reliquarium is a very unique set of four 3D slider puzzles, all with a Crystal Skull theme.

A reckless raider from Indiana has plundered tombs and displaced ancient relics. The objective is to return each relic to the center of its cubical box by rearranging the numbered blocks back into their proper order. Colors and numerals help determine the proper order.

Dragging the cursor rotates the cube for a better view angle. The mouse wheel zooms. Typing a number selects a block to move. Then use the keys {u,d,l,r,f,b} to move it.
Alternatively, you can select a block by clicking the cursor near your pick, prior to the move.

As indicated on screen, the (h)-key will toggle a help screen.

These puzzles are easy enough for children and will likely help with learning 3D visualization, geometry, problem solving and computer skills.

Works on Macs running OS-X and PCs running GNU/Linux. Note for Mac users: now comes with a Mac Binary Bundle.
There are 4 variations numbered 2, 4, 5, and 6, according to a dimension of each puzzle. Puzzles # 4, 5, & 6 are my own creations; while #2 is a well-known Grabarchuk puzzle. Generally, the puzzles with a smaller number are somewhat more difficult. Puzzle #4 is the most difficult.

Minimum system requirements: 

* graphics card & driver that supports OpenGL version 3.3 or later;
* GNU/Linux or a Mac running OS-X;