Screen	Monochrome
Shell colors	blue, orange, clear, blue/silver, translucent green, translucent purple, translucent yellow/black, white/blue, translucent blue, translucent teal, translucent black, silver/black
Manufacturer	Enix
Pet type	Pedometer
Programming	Custom
Release year	1998

These are a pedometer pet that come with a map that the slime will travel through as you walk. How cool is that? They also feature a good number of the usual functions you’d find in a vpet. Tinkerville has a good review of how they work here:
https://tinkerville.cutthatout.com/pedometer/dragonquest

Here’s another small website that goes over how to play with them:
https://arukundesuguides.weebly.com/

Basic Gameplay

In addition to the classic pet care functions, you will help the pet traverse a map that features seven different terrains by walking with it and letting it log your steps. There are grid-based maps included with the instructions, and you can chose which direction you will walk on this grid using one of the menu functions. As you walk, the pet traverses this map and you can reference where you’ve gone by looking at the coordinates it’s located at. Some of these locations will have secret items and locations, like caves, as seen in this reddit post, but I can’t tell whether or not they’re randomized or set.

Functions

Map
Steps
Stats
Food – specialty food (increases familiarity), meal (decreases hunger)
Game
Medicine
Wake up
Current evolution

There are different items you can use throughout the game to give your pet a hand up in battles or dealing with different terrain. This is needed because different slimes will take a different number of steps to cross different terrains depending on how well they are equipped to handle them. Some slimes cannot cross water without warp items, for instance. See the charts here for a reference of which slimes can do what: https://arukundesuguides.weebly.com/map-movement-and-secrets.html

Here’s a guidebook that goes over strategies in depth and talks about how the pet works. Unfortunately it’s only in Japanese, but I will try to translate and upload an alternate version soon.

ArukundesuGuidebook Download

Thanks to the weebly site I’ve linked above for the instruction book scans. Again, these are only in Japanese so I will try to translate and upload alternates soon.