All modern 3D MMORPGs require both a client download and account registration. This is mandatory for:
| Game | Style | Platform | Download Size |
|---|---|---|---|
| World of Warcraft (Starter Edition free ≤ Lv 20) | Themepark, Tab-target | Win/Mac | ~100 GB |
| Final Fantasy XIV (Free Trial ≤ Lv 70 + Heavensward) | Story-driven, Tab-target | Win/Mac/PS4/PS5 | ~60 GB |
| Guild Wars 2 (Core free, expansions paid) | Action-combat, Dynamic events | Win/Mac | ~50 GB |
| Black Desert Online (Buy-to-play, often free trials) | Action-combat, Sandbox, Life skills | Win/Console | ~80 GB |
| The Elder Scrolls Online (Base game free, sub optional) | Action-combat, Story | Win/Mac/Console | ~90 GB |
| Lost Ark (Free) | Isometric ARPG/MMO hybrid | Win | ~60 GB |
| RuneScape (Free / Members) | Point-click, Skilling | Win/Mac/Mobile | ~5 GB (NXT client) |
| Albion Online (Free, cross-platform) | Full-loot PvP, Player economy | Win/Mac/Linux/Mobile | ~2 GB |
No "no-registration" 3D MMOs exist—browser "MMOs" are usually limited multiplayer lobbies.