These are from the Cho Chikun collection I think. It's from the collection that "tasuki" posted on his website if I recall correctly.
Here you go: It's alway black to play. Live with your group or kill white's. You have to look for the best move - which means that sometimes ko may be a solution - if there is no better option.
And these are the moves I came up with early in the morning in the train
My handwriting is not especially good, but here it's also because the paper is really small and the train feels like a mixer. I also only mark the first move as there is not enough space for anything else.
I am especially interested in problem 258. Is move 3 some kind of tesuji - and does it even work here? [move 2 is meant to connect, as far as I could read anything else (including the move to the right of X) fails for white]
plays on the 3-3 point?