Hola/Hello!
I've been testing it for a couple of weeks now, and it's quite good. These are the only problems I've found so far:
1) the computer never lies for the Truco (for the Envido there's no problem, apparently). If it's the third hand and you put a 2 on the table, for example, and the computer has something lower, she will always fold... she'll never pretend she has something bigger than that 2. So if she says Truco, Retruco or Quiero Vale 4, you know she'll kill your card.
2) sometimes you are in a position to say "Quiero Vale 4" and the button is missing, and you just have to play your card to win the game.
Or now that I think about it, she could have had the "Quiero". I'll pay more attention next time, but I felt it happened twice already.
3) some of the help messages could use a little 'polishing'.
4) ppc said Envido (there was sound), I challenged her with another Envido, she challenged me back with Envido the rest (but the sound wasn't played, it was mute). She lied here, she had 25 and I had 30.
Oh, and there's a bug that's limiting my gameplay to only 5 hands
so I can't really test it properly.
kidding.
My PDA runs Windows Mobile 2005, and I think you shouldn't worry much about older versions of the OS, because your truco v1.0 runs fine under older systems... what we need is a proper Truco for WM5. This trial version you set up to run under WM5 has never hung on me so far, so everything seems to be fine... but you know, I could help you test some more if I had more options enabled
Good game, keep it up.
Edit: oops, it just hung on me for the first time, right after I posted this message. I was playing like the 4th hand, and suddenly the game closed and took me back to Resco File Explorer. I'm using the old WM5 version. Haven't tried your latest beta yet.