Ok. I did some more on the 4 on a row app for symbos..
It is still in development. But the main part is working!

DOWNLOAD THE EXE FILE IF YOU WANT TO TRY
Click on the RIGHT (mouse) button to drop your move (for 1 second!)
Funny idea: make it N on a row, where you can configure N yourself in an option menu
Indeed a funny idea, I was also thinking about making the rows itself dynamical. I have now four rows, but maybe the gameplay is improving with more rows. At the moment I'm stumbling with the computer-player a bit. I want this player as human as possible. So not to hard to win but also not to easy and not to predictable. Next thing is that I want to minimize the CPU utilization. It seems the mouse-over take a lot of CPU power because the imagebox is constantly refreshing on the form.
ah, yeah, also the amount of rows/columns... it's actually necessary to make N on a row work
ANyway, I'm sure someone solved this somewhere already, so a bit of Googling on what is sensible would probably work. (This is all very independent of SymbOS, MSX or programming languages, of course.)
I will Bing-ling a bit ..
The problem is that you can only use the supported functions at the moment
But with a lot of debugging I was surprised that I was come so far already
So my first MSX program is in Symbos haha
funny!
I did some update to improve the colors in the application. More to the real colors:

(I think better ?)
Ha ! I was able to create a icon in symbos
lol

How more I play with this how more fun I have!
Hi Edoz, can I ask why the counters are chunky. It saves no memory to have them double width pixels... draw them large and shrink them down rather than the other way around.
Well done on creating the icon too
Congratulation, Edoz! 
It's not only your first MSX program, it's also the first third-party SymBasic application!
