Bombs
Cracked walls, secret shops, and one very famous fuse timer — bombs have been the series' answer to 'that wall looks suspicious' since the beginning.
The Legend of ZeldaDownfall TimelineSold by the original 'It's a secret to everybody' shopkeeper; blast cracked cave walls to find hidden rooms.
A Link to the PastDownfall TimelineBomb shops and a growable Bomb Bag turn wall-cracking into a running side habit.
Ocarina of TimeShared Trunk (Before the Split)The Bomb Bag is Dodongo's Cavern's reward; remote-detonated Bombchus arrive as a bettable minigame prize.
Majora's MaskChild TimelineBombchus return, and the towering Powder Keg shows up for blockages ordinary bombs can't touch.
Twilight PrincessChild TimelineA Goron-run bomb trade supplies the Bomb Bag, and Bomb Arrows fuse this thread with the bow thread into one shot.
Breath of the WildDistant Future (BOTW / TOTK)Reimagined as a Sheikah Slate rune: unlimited round or square bombs, remote-detonated, no fuse timer at all.
Tears of the KingdomDistant Future (BOTW / TOTK)The Bomb rune is gone entirely — Fuse a Bomb Flower to an arrow or weapon instead, a deliberate, much-discussed removal.