pingpong update: the cart doesnt work on my power joy supermax so i'm guessing it's not actually standard hardware.
Also speaking of Timetop I recently got an "LTPS Handy Game" with 6 original VT03 games built in (25 including repeats, I think theyre the same games from the controller takashi had though) and a cart with 12 standard NES games on it plus, again, repeats. Also there was a sheet of paper included with Engrish game descriptions for an entirely different cart, including Nuts & Milk, which they referred to as "Dick & Milk".
...
It's actually quite a nice handheld though, shame you can't buy extra carts for it anywhere (that I know of).