That page will always show the 30 most recent listings that match your filters.  So for a very specific filter, the listings could stay up there for quite a while.  But for less specific ones, it might only last a day on that page....if even that.

If you have a handy list of those games for Mark III I can add them in bulk to our site instead of adding them one at a time.  Please give me a link to the best list you know of and I'll go from there.

Great example.  Thank you.  I can see why that would be helpful.

This is possible with two clicks and no page change.  You visit your collection:

https://www.pricecharting.com/my-collection

Then click 'remove' next to any item in your collection.  You are asked to confirm.  Then item is removed.

Thank you for that screenshot.  That search result page is for products themselves instead of actual listings.  I'll make a note about letting people exclude products if there is no listing available for that exact "include only" but that is much harder ask because all of those filters on the left are filters on the product.  Filtering by subsets of the items available is quite a bit harder from a coding perspective....at least with our backend.

Very odd.  I'm not sure why you don't see it there.  I see it on my end.

What game were you trying to add and I'll add it for you?  I'll look into what might be happening on the backend as well.

Can you give me a url of a page where you want only the consoles you own to be included?  I think this is a good idea to give that option but I'd like to know an exact page where this is happening because different pages have different console lists.  For example in searches, only the consoles that appear in the search will showup as options in the "filter by" drop down.  

Can you show me a screenshot of what you are looking at and a link to that page?  I'll look into this ASAP.

You can filter by "includes only" in the marketplace.  Here is a page showing that with all active listings.

https://www.pricecharting.com/offers?sort=starts&category=video-games&console=&condition-id=7&status=available

here is a result for one particular game:

https://www.pricecharting.com/offers?product=6528&condition-id=7&status=available

You set the "include only" for any page using the "Sort/Filter" box.

Mark III is listed in the drop down for adding games and it is called "JP Sega Mark III".  Sorry you couldn't find it.  SG-1000 has not been to the site.