A fairly old nostalgia inducing game in the genre of Rogue-Like Turn based RPG. It has graphics similar to something you might see on SNES.
With the addition of an online element. (In the jap editions)
Can be found here: http://homepage3.nifty.com/rfish/index_e.html

You will start out waking up in a cave with two people explaining to you the basics, after this noobie quest, you become the owner of said cave, with a nearby town.

Strangely addicting, and with a very random atmosphere, making difficulty more a thing of pure luck than anything else.
The quest system seems a bit deviated from the norm, you can pick up just about as many side-quests as you like from the notice board, albeit many are timed.

Several starter races (more mod and dev races can be enabled From Humanoid to demi-gods and even as a dragon), several starting class paths (Wizards, fighters, pianists and tourist to name a few), and dozens of skill sets, not to mentions spells.

One of the absolute hardest games to play as a mage with the randomness factor as well as limitations with spell casting..

Has a built in wizard mode for debugging/cheating. Though CE works for some things.
Not to be entirely confused with Elona-Shooter, as it's the PC game, which is the fore-runner of Elona-Shooter.

The official wiki explains toggleable wizard mode with offsets.
I would say This is a fairly good game to learn how to manipulate 4b data in general for basic purposes.