so i've never dmed before but i'm making a campaign for my friends. it's in a couple weeks and i'm planning for it to be a sort of labyrinth with puzzles, riddles, stuff like that. i wanna make a few props for the campaign. one of the puzzles is a stone bridge (inspired by the glass bridge in squid game). anyone have any idea how i could make a mini version in real life, with some of the tiles being breakable and others not? what materials would look similar enough that my players can't tell the difference?

make all tiles removable, and then remove the incorrect ones when they're stepped on