Based on Claire's interest in my still-missing Dungeon! board game, I went ahead and pulled the trigger on Kids Dungeon Adventure, a PDF set of rules for creating dungeon crawls using the blocks and toys you already have. I didn't know what to expect, but it held Claire's interest all afternoon as she helped me set up the dungeon and then explore it on a quest to rescue one of her stuffed animals from the clutches of a two-headed blue dragon. Claire completely ate it up; she'd get tense during combat and shout encouragement to her characters as she rolled the dice, and when she made a big hit or defeated a monster, she'd whoop and cheer in triumph.
The DIY aspect of the game extends beyond the "bring your own toys" ethos; the initial setup involves printing, cutting, and packaging up treasures to be discovered during the quest. Plan for at least an hour or two beforehand to get familiar with the rules, prepare those other things, and lay out the dungeon.
It feels a little incomplete for a paid product--it's heavier on the suggestions than rules, and could definitely use a little more polish--but in the end, it's a great idea and worth rewarding, as $6 is nothing compared to the joy of watching my daughter get so excited about gaming.