Proton

From RabbitWiki

Proton is a retro-futuristic, self-contained, abstract strategy PocketBoardGame for 1 or 2 players. It features an innovative design that utilizes existing manufacturing technologies, and is therefore very inexpensive, costing just $5 a unit. The 15 sliding tiles make up a dynamic gameboard which makes each game different. The game is so easy to learn that all of the rules, plus instructions for solitaire activities, appear on the back of the comfortably hand-sized plastic unit.

Lightweight and compact, Proton is the perfect go-anywhere board game. You can take it to the movies, the airport, or the great outdoors, and never lose any of the game pieces. Most games of Proton take about 5 minutes, so you can play it while standing in line or waiting for food in a restaurant. And if a game gets interrupted, you can put it in your pocket and resume it again (or not) with ease.

The Official Proton webpage can be found Here.

[edit] Rules and Errata

Rules for Proton can be found Here. And the Proton FAQ can be found Here.

[edit] Variations

Several selected solutions can be found Here.

[edit] Demoing Advice

(Links to wiki article pages here.)