Dungeon Delvers (2013)

webpage blurb:
Dungeon Delvers is an ultra-portable one-page D&D variant.

It packs a lot into one page: rules for attacks and saves, 4 classes, 3 races, spells, healing, conditions, and monsters. The system uses only a d6. There's even a rock-paper-scissors system for rolling a d6!

System Overview

All rolls are 1d6. Roll 1d6 each for the 6 classic abilities. Attack rolls succeed on 5-6. All other rolls are ability rolls, which succeed if they roll less than or equal to the relevant ability. Ability rolls are used both as skill checks and as saves.

Fighters deal extra hits per level, rogues get a bonus on ability rolls, wizards get one spell per level to use at-will, and clerics can cast any one spell of their choice once per day (more at higher levels).

The game package includes:

• A two-page PDF containing the rules on one page, and an expanded spell list on the second page. The spell list includes spells for wizards and clerics levels 1 through 3 (that's a lot of play time).
• A one-page PocketMod PDF of the rules that can be printed and folded into a booklet that will fit in your pocket.
• An .azw3 file containing the rules and expanded spell list, for use on newer Kindles.
• A .mobi file containing the rules and expanded spell list, for use on older Kindles.
• An .epub file containing the rules and expanded spell list, for use on iPads and other eReaders.