This particular experience I'm referring to was...yesterday. Smart usage of sudoku techniques carry you quite far, when the solvers are needed you sometimes fail on poor luck (I hit a 3% voltorb on my first tile yesterday) but the majority of the time they carry you to where if you're at risk of hitting a Voltorb you've had your 6 or 7 tiles already hit to prevent you from dropping. As long as you don't fuck up you should be able to win every 2nd or 3rd board at level 6 or 7 and it only takes fifteen or so wins to get your 10kI wanna chime in and say that this contradicts my experience. I've played VFlip on actual cartridge and it has taken me hours (no, really, it did take hours) to obtain just ONE TM. Afaik, the online solver isn't really good either (first time I used it, it told me to flip a card that turned out to be a Voltorb...). Emulator players can easily get them because of states (and hacking in coins) but any cartridge player is gonna suffer.
Also, Voltorb Flip is definitely not sudoku, sudoku doesn't put you into 50/50s scenarios 4 times per level (this actually happens in higher levles, you get pitted in a lot of 50/50s, sometimes even worse). If you get a bad grid on later level where it's pretty much impossible to predict which row or column is safe to risk on, you can easily lose and go back to level 1 (if you have flipped less cards than the current level, you drop to the level that equals the amount of cards you flipped before losing).