This is on the site:

https://www.pricecharting.com/game/nintendo-3ds/mario-&-luigi-bowser's-inside-story-+-bowser-jr's-journey

This is a duplicate.  Please cast your vote for this issue here:

https://pricecharting.userecho.com/communities/1/topics/378-add-famicom-disk-system-games

We already have this available.

You can see all the Vita games here and their values:

https://www.pricecharting.com/console/playstation-vita

You can see all the Vita games available on our marketplace to buy here:

https://www.pricecharting.com/search-products?console-uid=G43&stock=in

We have that here:

https://www.pricecharting.com/game/playstation-4/gran-turismo-sport

And the limited edition:

https://www.pricecharting.com/game/playstation-4/gran-turismo-sport-limited-edition

Added Nintendo Power.

https://www.pricecharting.com/console/nintendo-power

I'm going to let people request specific magazines in other threads so I know which are the most popular.

We've added Nintendo Power issues

https://www.pricecharting.com/console/nintendo-power

Not exactly strategy guides, but very similar

Do you get an error message at all?  You have to have contributor status on the site in order to add a game so not all users will be able to use it.

This tool is live for all users with contributor privileges.

https://www.pricecharting.com/add-product

After you use it, please give us any feedback to improve it.

Sorry if you did not receive enough notifications.  I'll look into that. I can restore your collection for you.  Please give me the link to your empty collection page and I'll restore all the items for you.

https://www.pricecharting.com/game/jp-sega-dreamcast/hello-kitty-dreamcast-system