Chainfire 3D Pro

Another poor feature of Samsung Galaxy Y is that it can't run HD Games, so I found a way to run it.
Its easy as compared to rooting. You must have your device rooted.

Chainfire 3D is the program which reduces the texture quality/size and runs it on your device.
So firstly download Chainfire 3D Pro + Plugins from here.
Extract these files.( Remember the plugins in the zip file should be extracted once only in such a way that it is again in the zip file) and transfer the .apk and .zips to the device.
Now install the Chainfire 3D and open/run it.
Then select CF3D driver. Install CF3D driver.
After that select Install Plugins/Shaders.
The three zips of plugins will be found.
Select them to install.
Open either Default OpenGL Settings or Per-app OpenGL settings.
Now it depends on the game, if its not fitting on your screen select 'reduce texture size' and load the plugin 'NVIDIA' and if its not opening only select 'reduce texture quality' and load the plugin 'QUALCOMM'.
You may refer to the youtube videos for particular games selection.
Default Open-GL Settings will be set for all applications and reduce the quality of images in gallery too.
That's why select Per-app Open-GL settings preferably.

Thanks for reading.