$3 currently gets you threefourfivesixseveneightnine ten PDFs. If it does as well as the 2020 challenge, you'll end up with a dozen PDFs for the same price by the time all the stretch goals are over.
Arden Vul is the most ambitious megadungeon ever created, with over 1,100 Pages of Incredible Adventure. This First Edition compatible fully-bookmarked PDF product features:
2,162 Encounter Descriptions
14 NPC Factions
10 Massive Levels
15 Extensive Sub-levels
7 Dangerous Exterior locations
149 New Monsters
332 New Magic Items
69 New Technological Items
44 New Spells
189 New Books through which PCs can gain a deep understanding of the dungeon
A full NPC appendix with 10 competing parties at 3 levels of power
Over 140 original pieces of art, including 28 full-page illustrations!