Graphics: 7
Sound: 8
Controls: 8
Total: 8.5 of 10
Pros:
-Fast paced
-Lot's of unlockables
-Different paths
-Completely dubbed in German with the professional Sonic X actors
Cons:
-The approximately 30 frames per second slightly slow the pace of the game
-Few Boss fights
-Camera ocassionally unreasonable
-Loading times could be shorter
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Unlockables: 14 character biographies, 50 pieces of music, 130 concept-arts and 13 videos
A few skills: Run faster under water, lower loss of speed while going up slopes and 8 more
Sonic 1 will cost 7777 points
Chaos Emeralds seem to be obtained from bosses: "(...) Or the fight with Metal Sonic to get one of the seven magical Emerald-Crystals.
Main game (9 Zones, 18 acts) will take about 4 hours, adding missions, Emeralds etc, 3 more. Not sure if this means collecting the Emeralds has nothing to do with the story. Might be that you have to recollect them to use SS in stages. But I dunno.