"bilbobilbo":
Well, I saw in news that there is a igridd book with puzzles larger than 50x50.
Does this mean it will be also possible in near future to submit such larger puzzles in workshop?
I have a 600x600 puzzle waiting

)
Some explanations about the Large Puzzles.
Large puzzles will only be on paper, not online. The applet to wider/higher puzzles will be too heavy to download, besides, even the maximum size (50x50) grid we have online is too big for some solvers.
Since those puzzles can only be on paper, we still need to see how attractive they are. We make books upon demand, if there will be a need for large puzzles we will ask our creators to make them for us, and set the workshop for those sizes.
In the
International Meeting in Delft we had a one part 500x500 puzzle. The following picture shows how big this puzzle is:

We still hope that someone will be able to solve it. :-)
I have a 600x600 puzzle waiting )
You have a 600x600 image? It is too big for the workshop! The maximum is 500x500. i.e.: 100 parts of 50x50. So, you will need to make it smaller first and sent it to the team to review it before submission.
Hagit