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Message: <blockquote data-quote="S'mon" data-source="post: 4918835" data-attributes="member: 463">This sounds like a good approach.  I just ordered Dungeon Delve with an eye to using it for sandboxing, similarly.  My current 4e sandbox (converted Vault of Larin Karr) has been going 4 sessions and seems to be working fine.  I think 4e is actually a lot more robust and able to cope with the sandbox approach much better than you'd think from reading the 4e DMG, which advises that if you do run a sandbox (called there a mega-adventure) you constantly tweak the locales' toughness to fit current party level.  It also advises that each adventure locale in the sandbox have 8-10 encounters so the PCs level each time.  I think those are both poor advice, much better to have smaller locales (ca 3, or 1-5, encounters each), and tweaking them only in extremis.  And there should be a noticeable threat gradient, eg in Larin Karr the Underdark beneath the valley is significantly nastier than the overground locales.</blockquote>