Earlier today I was clearing through some old books, and found these:
They are basically copies of the Where's Wally books, but with Sonic instead. You have to find 1 Sonic, 1 Tails, 1 Doctor Robotnik, 1 Chaos Emerald, 2 Starposts, 2 TV Monitors and 10 Golden energy rings on each page which is themed after a level from Sonic 2 or 3.
Can you find them all? :P