Planescape: Purgatorio

Well, this brings back some nostalgia.

Sadly never completed. This and the Prime Material demo were all that was released.

Wonderful areas with lots of detail. As noted, it's not complete, however:

• You can do a number of side quests and progress through several interesting areas
• Four major quests can be completed gaining a 10th level PC roughly two levels. Solo it would be higher. The original page said up to level 20 but too many quests could not be completed for me.
• The major side quest for lawful PCs is blocked by bad trigger or script.
• Neutral or chaotic PCs will have the most opportunities
• Not being able to do everything actually makes the environment a little more believable.

Nice to walk around in and just explore. A well equipped 10th level PC may not need companions and will gain more XP from combat.

Companions:

• Working: Assassin, Bard, Cleric, Paladin, Rogue, Sorcerer, Wizard
• Bugged: Monk, Blink Dog, a few others
• Some can only be recruited by accepting or completing a specific quest
• Not all will join at the PCs level and you may have to use console command "givexp" to get them at least close to the right level.
• You will also gain and lose some henchmen during some quests.
• Some areas have heavy levels of locks and traps, be prepared.

Combats were mostly easy, it appears that the developers had not gotten to the point of balancing the entire module. A few combats will be very challenging depending on your party and build. 

Social:

There are quite a few checks for social skills and related abilities. Only the PC's skill levels will count for most of these. Conversations indicate one or more companions were to be romance-able although it's not clear how far those stories were intended to go. There are at least two or three brothels and some nudity so there was probably a plan of some sorts.

Several conversation options are only available the first time the PC talks to key NPCs.

Crafting:

• OC crafting is supported although supplies are severely limited
• Not all of the distillable items worked correctly.
• There were not enough components available to bother with making thrown weapons or traps.
• There are very few molds or ingots
• There are plenty of mundane, silver, cold iron and one or two adamantine weapons available to upgrade.
• Gems are limited but can be both purchased and found.
• Essences are the most limited component. Use them wisely.
• If you reuse a fully equipped PC from other adventures, it might be good to bring whatever crafting supplies you feel you need with you.

Treasure:

• Lots of unique items with setting related descriptions
• Lots of small loot drops and incidental treasures scattered about.
• Mostly mundane gear early on with more custom items (extra damage, skill points, penalties) than simple +1/+2 gear.
• Items +3 or better are very scarce.

Quests: The four major stories I was able to complete were -

• Beastlands
• Mechanus
• Baator (this looks like part of the main plot and explains why you are "drawn" to the planes to begin with)
• Pyramid (you will need good search skills to complete this one)

In my play-through, retuning from Baator put me directly into the Pyramid quest path. I did not see an opportunity to avoid that although there may have been other variables or checks my PC did not trigger.

While it's true that this is a demo of an incomplete project, there is enough content here to provide several evening of exploration, combat, and adventure. Each major quest took me a full evening to play. You will hit some dead ends and bugs that halt progress along one path but you can just go off and look for other opportunities. It's the very much in the tradition of D&D.

Enjoy!