TCGX on your phone screen
There is nothing to download from the App Store or Google Play - TCGX has no app there and does not need one. You add the site to your home screen and launch it like a normal app: its own icon, full screen, no address bar.
Type tcgx.pl into Safari on an iPhone, or Chrome on Android.
Find your browser’s option to add the page to the home screen and confirm the icon name.
The icon lands among your apps. From now on you open TCGX there, not through the browser.
Safari is the simplest route: the share button in the bottom bar, then scroll down the list to find the option. Chrome and other iPhone browsers can do it too - the entry lives in their own menu, just somewhere else.
Chrome usually offers it by itself with a bar at the bottom of the screen. If the banner is gone, or never showed up, open the three-dot menu - the entry lives there permanently.
The icon points at the very page you are reading: it takes no app storage, updates itself, and needs no account in any store. Remove it like any other icon - press and hold, then delete.