A platform wasn’t listed in this BBFC entry, but the the inclusion of a Sonic Chronicles video might shed some light on that.

We’ve had an awful lot of games revealed by ratings information recently, and we’ve got another one to add to the group with BBFC rating ’SONIC CLASSIC COLLECTION’. According to the description, the collection "is a compilation of arcade-style games featuring the popular Sonic the Hedgehog character and friends in various time-based challenges."

While many ratings organisations don’t necessarily list everything included in a compilation, the BBFC certainly does. You can see a list below:

n/a SONIC CLASSIC COLLECTION
n/a SONIC THE HEDGEHOG (GAME)
n/a SONIC THE HEDGEHOG 2 (GAME)
n/a SONIC THE HEDGEHOG 3 (GAME)
n/a SONIC & KNUCKLES (GAME)
n/a KNUCKLES IN SONIC THE HEDGEHOG 2 (GAME)
n/a KNUCKLES IN SONIC THE HEDGEHOG 3 (GAME)
00:00:45:00 SONIC CHRONICLES - THE DARK BROTHERHOOD (VIDEO)
00:03:05:00 THE HISTORY OF SONIC (VIDEO)
n/a SONIC ART (IMAGE GALLERY)
00:05:15:00 SONIC CLASSIC COLLECTION CREDITS
n/a GAMEPLAY FOOTAGE

The Sonic Chronicles video contained certainly leads us to believe it’s a DS collection; if it was on a home console, wouldn’t they advertise games like Sonic Unleashed and Sonic and the Black Knight instead? The fact that technically only four games are included—Sonic & Knuckles itself is used to add Knuckles to Sonic 2 and 3—also suggests this would be a better fit for a DS card.

As usual, nothing indicating a release window is included in the rating, but we’ll keep you posted.

Source: BBFC