Yeah, it has a timer and you lose 2 minutes for each mistake.
But I ran out of time only twice so far.
There's also a Mario Picross 2 on the SNES, it's Japan-only though.
The actual name of this type of puzzle is Nonogram, there's a lot of online and printable puzzles with different sizes for all tastes.
Here a couple I found:
I also like to play a lot of Sudokus.
Thanks for those links.I found a seasonal puzzle - snowman wearing a cowboy hat
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That's great, you found your own cowboy hat!
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