My own review of Sonic Generations for 3DS.

[MarioMover]

It's not as grand as it's HD counterparts; that much is true. But in it's own right, Generations 3DS was a good game.


GAMEPLAY:
As the HD versions do, the game features Classic and Modern Sonic, each with their own play style.
Classic Sonic has his moveset from Sonic 2. (The Homing Attack is later unlocked.) Modern Sonic's gameplay style matches that of Sonic Colors DS (Homing Attack, Stomp, Boost, Wall Jump).
It's fast-paced. It manages to emulate the speed of Colors and Rush, and in some instances the Advance games. The platforming fits well with the game, and it's not too difficult to both maintain speed and do platforming at the same time (minus some areas where you have to slow down, like Radical Highway).
Gameplay score: 7.5/10

LEVELS:
So the HD versions of Generations had a fantastic level-set. Generations 3DS had a solid set of levels, but in my opinion it pales in comparison to the higher-end version of the game. Not only are there two less levels (7 compared to 9), but the level selection feels weak. It feels more like a "first level" compilation than a celebration of the game's best levels. (Green Hill from Sonic 1, Mushroom Hill from Sonic & Knuckles, Emerald Coast from Sonic Adventure, Radical Highway from Shadow's story in Sonic Adventure 2, and Tropical Resort from Sonic Colors.)
Now the level design is okay. It's not nearly as fleshed out as the HD version, but it works. The entire game is 2D, and the levels feel quite a bit more linear than the HD version. Now, I have two problems with the classic levels. For the Genesis era, the Classic levels are ripped straight from their first games - however, due to Classic Sonic's speed/physics/whatever, the levels feel so much smaller than their Genesis counterparts.
My other problem is the Homing Attack. After completing the Genesis era, Classic Sonic unlocks the Homing Attack. However, the Homing Attack CAN'T BE DISABLED. Once you unlock it, you are forced to play the rest of the game with it enabled. This wouldn't bug me if it weren't for one thing - If your Classic Sonic levels require a Homing Attack to complete, then you need to redesign the levels. From Emerald Coast on-ward, Classic Sonic feels more like Sonic 4 than Generations. (Albeit, a Sonic 4 I enjoy playing, but still Sonic 4.)
Level score: 6/10

MUSIC
The soundtrack is weak in the 3DS version, compared to the HD version. Most tracks just feel like some new instruments slapped on the original track, and in Tropical Resort: Act 1's case, is literally UNCHANGED from the original. It just felt lazy. (The worst offenders: Casino Night: Act 1, Mushroom Hill: Act 1, Emerald Coast: Act 1, Tropical Resort: Act 1)
There are some tracks that stand out, though - ESPECIALLY the Big Arms boss battle. By far the best song in the entire game.
Most of the other notable tracks are shared with the PC/Xbox/PS3 version of the game, like Casino Night: Act 2, the entirety of Green Hill, and the Rival and Final Boss battle music.
Music score: 7/10

BOSSES:
The bosses in this game were nothing special. I still don't like the Time Eater, that is the same. The Big Arms battle feels like it was just ripped straight out of Sonic 3, although I'd argue that the music kind of makes up for it. The other two bosses weren't anything extraordinary.
The rival battles, on the other hand, are just LAZY. It's literally just a race through a level against your rival. This wouldn't be a problem if the levels weren't so bland. But the rival battle levels are just so...boring. Collect some Rings, boost around a lot, hit a spring, jump a few platforms or two. It's really just a matter of how well you can manage your Boost Gauge.
Boss score: 6/10

SPECIAL STAGES:
The special stages in this game are from Sonic Heroes. It's just a matter of, again, managing your boost. Not too difficult.
Special Stage score: 6/10

POST-GAME:
Like Sonic Generations PC, there are missions. These are optional, however, and are not required to beat the story. Like their PC counterparts, beating a mission can unlock music, art, or a 3D model for you to view. There are 100 of them in total, and they're not too bad.
There is also an Online Multiplayer mode. This is something I wish the HD versions of the game had. It's just a 2-player race, but it does encourage the player to find the best route throughout every level and helps push the player.
Post-game score: 7.5/10

Sonic Generations for 3DS is a good game...if you don't go in expecting Sonic Generations. It's not the same grand adventure as the other versions. If you go in expecting just a Sonic game, just some high-speed platforming fun, then this game has you covered. After all it's a portable title, so I wouldn't expect the same immersion as the console release. The game is fast-paced, it's enjoyable, and has enough content to last more than a few days. The replay value is okay, and compared to other modern 2D games, this one holds a special place in my heart as the best.
If you haven't already, I'd recommend you pick the game up.
Overall score: 7.5/10

[maoraharon123]

great review! I personally didn't enjoyed the game

[Yam7687]

Pc version better tho 3DS ver is goo not bad actually