[mrchicky5]

after getting the 8th item from your inventory
theres another message saying "notice: your inventory is now full"

[Cooky]

or you could just learn to count from 1 through 8? all you gotta do is check your inventory before you start playing. And if you lose track you can go check your inventory in between games.
it would be helpful I suppose but isnt really necessary in my opinion.

[HotDoggie]

i meant 10th

[ZxEnvyxZ]

I just press alt+tab or make it windowed and go to marketplace and go to my shop and click add item.