That’s great and all, but presupposes that whoever’s on the other end of that panic button will actually respond and do so effectively or in time. Uvalde and Parkland both had cops make it on site in a reasonable amount of time, but they were basically useless in both cases.
It’s a bit niche, but I like Japanese mahjong (not the tile matching thing, the actual game) and have gotten hours out of an app called Kemono Mahjong. Cheap, onetime purchase w/no micro transactions and you can play against adjustable AI offline or online with others. It has plenty of guidance for new players.