Reliquarium is a set of 3D geometric slider puzzles for kids, with a Crystal Skull theme...

Reckless raiders have plundered a sacred tomb and displaced an ancient relic. The objective is to return the relic to the center of its cubical framework by rearranging the numbered blocks back into their proper order, which also represents an RGB coloring...Red in the X-direction, Green in the Y-direction, Blue in the Z-direction.

Dragging the cursor rotates the cube for a better view angle. The mouse wheel zooms. Typing a number 1..8 selects a block to move, 0 selects the relic itself. Then use the keys {u,d,l,r,f,b} to move it.

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;