CLOK started as a self-teaching Python project text-based game.
Project evolved into a MUD, using completely unique code with Twisted.
Others have joined staff and used the project to learn to code.

The game is stated as being in alpha, though is completely playable.
There are ongoing storylines and events, roleplay is enforced.
The genre is a mixture of medium-low-fantasy/gaslamp/wild west.
Guilds available to learn special abilities, but not required.
Some guilds are more about abilities, others about facilities/perks.
Some guilds have strict morals and guidelines, others are more open.
The races are all human races, not species such as elves/orcs/etc.
The magic is heavily scrutinized to make as much sense as possible.
(We try to make magic scientifically sound, instead of handwaving)
Stereotypical "good" and "evil" factions, as well as neutrals.
NPCs have factions, possible for PCs to join or be neutral with them.

Skill levels are based on practice - no vague "experience levels".
Combat not required to advance-there are many non-combat activities.
Ongoing focus on crafting and professions (farming, cooking, etc.).