Scribblenauts Unlimited

In 34 libraries here. 24 launched it, and the typical player put in 2.9 h. 2 finished it.

The main story is about 4 evenings of two hours, or 5 with the extras.

Named in 0.5% of Name 100 runs, about 1 in 187: people remember it when asked to name 100 games from memory.