Another training puzzle, this is a 123 box, a variation on the ABC box that was introduced at the German Logic Masters.
Also, I’ve posted a Doppelter Rundweg on the puzzle portal. That one is probably the hardest puzzle I’ve constructed to date.
Rules Put a number from 1 to 3 in each cell. The hints correspond exactly to connected groups of equal numbers within that row/column. A number clue stands for a group that consists of that number, or is that size, or both. A question mark clue stands for an arbitrary non-empty group.
There’s an example with the (German) instructions on the puzzle wiki.