That game got Tron much better than the 2nd movie did.
Having the "grid" be this walled garden didnt explore how the whole world is interconnected now. It was a terribly missed opportunity.
To add insult to injury, the game is a Disney property. Disney owns the plot of Tron 2.0 that they ignored in favor of flavorless eye candy.
*SPOILERS*
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The game's plot includes features like the internet, making the Recognizers into network packets (train cars) for some nice nostalgia, bits*, trying to survive in a PDA with limited RAM, email scripts being corrupted into virus spewing zombies, and an evil mega-corp planning to use the digitization tech to digitize their own paramilitary operatives into the grid so that they can literally brute force attack their enemies' computers from the inside.
*to me, the biggest example that the TRON Legacy writers were not TRON fans is that CLU2's yes-man wasn't a bit. A bit that just says yes, reluctantly says no, is destroyed, and another bit takes it place to say "yes" would satisfy nostalgia, show us CLU2's personality, and provide a little color to an otherwise bland movie.