Sonic Generations Cheats

Level Select in Sonic the Hedgehog
After unlocking the classic Genesis game Sonic the Hedgehog, load the game. After Sonic appears on the title screen, hit the following buttons in order: Up, Down, Left, Right, X. If done correctly a menu will pop up with all acts selectable.

Secret Statue Room
In the Secret Statue Room, press the SELECT Button to bring up the code screen. Then just enter the code.

008 140: Chaos Emerald
070 178: Spring (Yellow)
103 729: Classic Eggman
125 817: Egg Pawn
171 045: Classic Sonic
200 078: Egg Chaser
204 390: Sonic the Hedgehog
209 005: Item Box
226 454: Charmy Bee
249 651: Cucky/Picky/Flicky/Pecky
262 416: Shadow the Hedgehog
275 843: Grabber
277 087: Metal Sonic
283 015: Goal Ring
309 511: Chip
329 494: Aero-Cannon
332 955: Cream the Rabbit
353 012: Big the Cat
359 236: Classic Tails
360 031: Eggrobo
363 911: Crabmeat
383 870: Jet the Hawk
390 884: Ring
466 913: Spiny
483 990: Moto Bug
495 497: Booster
507 376: Hero Chao
513 929: Iblis Taker
530 741: Spinner
537 070: Spring (Red)
544 873: Blaze the Cat
548 986: Sandworm
601 409: E-123 Omega
613 482: Dr. Eggman
629 893: Chao
632 951: Miles "Tails" Prower
639 402: Chopper
640 456: Cop Speeder
668 250: Gun Hunter
679 417: Knuckles the Echidna
688 187: Silver the Hedgehog
711 268: Iblis Worm
777 921: Capsule
851 426: Egg Fighter
852 363: Buzz Bomber
863 358: Amy Rose
868 377: Vector the Crocodile
869 292: Dark Chao
870 580: Omochao
872 910: Iblis Biter
888 200: Rouge the Bat
894 526: Espio the Chameleon
933 391: Goal Plate
973 433: Egg Launcher
975 073: Gun Beetle

Unlock the original Sonic the Hedgehog for play
In order to unlock and play the original Sega version of Sonic the Hedgehog you just need to buy the sega controller from the shop located to the left of Green Hill Zone and then just take the controller to the Sega Console located in the top left area of Green Hill Zone.

Trophies
There are 37 Bronze Trophies, 10 Silver Trophies, 2 Gold Trophies, and 1 Platinum Trophy.

(Hedge)Hogging It All Up! (Gold): Get all collectibles.
A 30-Second Test (Bronze): Participate in a 30 Second Trial.
Action Hero (Bronze): Perform all of Sonic's moves in Act 2.
All Stages Cleared! (Silver): Clear Sonic Generations.
All Trophies Collected! (Platinum): Collect all Trophies.
Big Bang (Gold): Get Rank S in all Acts.
Blazing Meteor (Silver): Get Rank S in seven Acts.
Blue Comet (Silver): Get Rank S in twelve Acts.
Bonds of Friendship (Bronze): Complete all Challenge Acts featuring Sonic's friends.
Bright Star (Bronze): Get Rank S in an Act.
CHEMICAL PLANT Restored! (Bronze): Restore the CHEMICAL PLANT Stage Gate.
CITY ESCAPE Restored! (Bronze): Restore the CITY ESCAPE Stage Gate.
Eradicator (Bronze): Defeat 100 enemies.
Greased Lightning (Bronze): Clear GREEN HILL Act 1 within one minute.
GREEN HILL Restored! (Bronze): Restore the GREEN HILL Stage Gate.
Halfway Point (Silver): Clear half the Challenge Acts.
Join the Ranks (Bronze): Join the rankings.
Mission Accomplished! (Silver): Clear all the Challenge Acts.
Red Ring Collector (Silver): Get all Red Star Rings.
Ring King (Bronze): Reach the goal without dropping any of the rings you collected in GREEN HILL Act 1.
SEASIDE HILL Restored! (Bronze): Restore the SEASIDE HILL Stage Gate.
Shooting Star (Bronze): Get Rank S in three Acts.
SKY SANCTUARY Restored! (Bronze): Restore the SKY SANCTUARY Stage Gate.
SPEED HIGHWAY Restored! (Bronze): Restore the SPEED HIGHWAY Stage Gate.
The Opening Act (Bronze): Race through the first stage.
Time Attacker (Silver): Play Ranking Attack on all stages.
Trickstar (Bronze): Pull off a seven or more trick combo or six trick combo ending in a finishing trick.
Walkie Talkie (Bronze): Chat with each of Sonic's friends you have saved.