I forgot to add if your son likes Spider-man, you should try Spider-man: Friend or Foe. It's a beat'em up that's rated E10+ compared to Ultimate Spider-man which is rated T for Teen. It has no language of any kind from what I know, and the controls are very simplified. It doesn't have an open overworld, and most of the levels are in the form of 3D sidescrolling and they're very linear, so it probably won't confuse him. You can also play the whole game in 2 player co-op. If you haven't heard of it, check it out. Again, as I said in my last reply I will try to improve my kid friendly list, but it's pretty hard to get good games for 4-, as there aren't that many on the market for that age group. But, I will try my best to find and add them.
To add one more thing...
I forgot to add if your son likes Spider-man, you should try Spider-man: Friend or Foe. It's a beat'em up that's rated E10+ compared to Ultimate Spider-man which is rated T for Teen. It has no language of any kind from what I know, and the controls are very simplified. It doesn't have an open overworld, and most of the levels are in the form of 3D sidescrolling and they're very linear, so it probably won't confuse him. You can also play the whole game in 2 player co-op. If you haven't heard of it, check it out. Again, as I said in my last reply I will try to improve my kid friendly list, but it's pretty hard to get good games for 4-, as there aren't that many on the market for that age group. But, I will try my best to find and add them.