Odd Pair Sudoku

I just wondered if anyone else had given these a go and what do they think? Deceptively tricky I thought - maybe I'm just missing something? At first glance I thought they would be fairly easy but it seemed to take me ages before I had anything other than'O's for odd and 'E's for even in the boxes, but after a bit of perseverance things finally began to fall into place and I've got the first two done. Just the other two and then for a go at the samurai! I do like the trickier puzzles if you can get there in the end!

Am really enjoying the new varieties you keep publishing Gareth - keeps the old brain cells ticking over!

Yes, thanks to comments here and on my blog I've decided these are too hard when made large so I don't think we'll be seeing any more Samurai versions of this - but there are four more 9x9 ones in issue 5!

Well, I've not cracked the samuai version in issue 4 yet, but not prepared to give in as yet!

The 9 x 9 puzzles in issue 5 are quite a bit easier than the ones in issue 4 and as such very good fun. Would like to see them continue.

I'm definitely going to keep them in as a variant, but I just think the Samurai was pushing it a bit too far. I think with this sort of constraint puzzle it's important to use it lots - perhaps the ones in this issue were a bit better in that respect because I didn't prune them so heavily, maybe. So thanks for the feedback!