Both of games are available for free on Windows Phone Store. Especially for "Subway Surfer", this game is require minimum 1 GB of RAM. For 512 MB of RAM will be available later.
" DASH as fast as you can! , DODGE the oncoming trains! . Help Jake, Tricky & Fresh escape from the grumpy Inspector and his dog. "
- Nokia Lumia Windows Phone 8 with 1 GB of RAM
" Dive in and join Nemo on his latest adventure. Build a beautiful reef, and make a home for your favorite Finding Nemo characters!. "
- Nokia Lumia Windows Phone 8