Pay just 78p ($1) and you'll get Sonic Adventure 2 and its Battle DLC, Sonic 3 & Knuckles, Sonic CD and Sonic Adventure DX. This is a very good deal.
Pay more than the average (at the time of writing, £4.58) and you'll get Sonic Generations and its Casino Night DLC, Sonic the Hedgehog 4: Episode 2, and Sonic & Sega All-Stars Racing. All great games. You also get Sonic Lost World, which is rubbish.
Pay £7.78 ($10) and you'll get Sonic Mania and its Encore DLC, which is worth the price. And you'll also get Sonic Forces, which you can quietly delete to save yourself from accidentally booting it up.
Interested? You have 20 days left before the Humble Bundle speeds away.