For a limited time, Steam is having a Sonic game franchise sale with up to 75% off normal Steam prices: http://store.steampowered.com/sale/sonic
Please note, all Steam prices are in US dollars.
Sonic & Sega All Stars Racing: US$2.49
Sonic & All-Stars Racing Transformed: US$4.99
Sonic Lost World: US$10.19
Sonic Generations: US$12.48
Sonic the Hedgehog 4 - Episode I: US$1.74
Sonic the Hedgehog 4 - Episode II: US$4.99
Sonic 3D Blast: US$1.74
Sonic Spinball: US$1.74
Sonic the Hedgehog: US$1.74
Sonic the Hedgehog 2: US$1.74
Sonic 3 and Knuckles: US$1.74
Sonic Adventure DX: US$1.99
Sonic Adventure 2: US$3.24
Sonic CD: US$1.74
Sonic Games Collection: US$54.49
Any idea on what the best non-racing sonic game is for kids?