Sonic the Hedgehog's anniversary Humble Bundle is a cheap way to celebrate his past 25 years

Sonic the Hedgehog's 25th birthday is this Thursday, June 23, and Humble Bundle is making it easy to revisit his classic games. A variety of Sonic games from the past quarter-century are now available in a pay-what-you-want package.

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The first tier includes Windows PC copies of the original Sonic the Hedgehog, along with Sonic Adventure DX, Sonic 3D Blast and Sonic CD. Buyers will unlock at least four more games if they pay more than the current average of $12.33, including Sonic the Hedgehog 2 and Sonic Adventure 2 Battle.

For a minimum of $10, Sonic fans will also get four, more current games, like Sonic Generations. An exclusive anniversary shirt is part of the $35 tier.

Those who have played and replayed many of Sonic's games over the years will have to make do with what they've already got. Sega hasn't announced a proper anniversary title in the franchise yet, although more news is expected around San Diego Comic-Con in July.