Not logical? I can't find anywhere to continue this.

Use google and write it out...

Well that's not happening, a picross shouldn't require Google of all things. No point trying if it's not logical.

Dreadful horrible amount of guessing - really not worth it.

Match of the Day.

M-5x5 Square 1 & 6 (Capital)
a-5x5 Square 7 (lowercase)
t-5x5 Square 3 (weird lowercase)
c-5x5 Square 9
h-5x5 Square 5 & 10 (lowercase)

Hope this helps.

It´s definitely not "horrible amount of guessing". I guessed only "M" in top left corner (to make it faster - not sure, whether it is logical or not) - and the rest was completely logical...

Big waste of time. :(