Yep. Also gotta check under every stairwell and waterfall. And if a NPC is telling you to hurry, it means it's time to check every nook and cranny to make sure you haven't missed some loot.
This mentality has mutated into a principle of doing anything other than main quest in open world games for me. In the latest zelda game I spent way too long trying to figure out how to unlock the map by traveling to different vantage points, climbing towers etc, before deciding to do a little bit of the main quest and the map is almost the first thing you do.
That secret entrance behind a waterfall in the original Legend of Zelda meant that I've been checking every waterfall in every game I've ever played since 1986.
The first panel shows a blond man wearing a green sleeveless shirt, long brown pants, sturdy brown boots, brown bracers, and a belt and sash, standing against a forested backdrop with a signpost to his right reading "START".
The second panel shows the START signpost is far to the right edge of the panel and the blond man has turned and walked directly into a rock wall with an onomatopoeic WHUMP!
The last panel shows a brown-haired, bearded man in green shirt, blue pants and glasses, sitting on a cream-coloured couch next to a blond-haired boy wearing a blue shirt and black shorts. The man is holding a controller for a video game console. The boy says "Why do you always start every level in every game by turning around and running backwards?". The man replies "because one time a game hid a secret behind the start position and my OCD decided I have to suffer for the rest of my life."
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The only other game besides DKC I know of with something like that is in 1-1 on Demon's Souls. Turn around from where the Archstone takes you, and there is an item behind some rubble toward the wall/gate. It's not as cool as a secret as the banana hoard tho.
I bet it's much more common in newer 2D platformer games just because of that, though. I don't really play those myself.
DK Country on SNES is one of my all-time favorite games that I continually go back and play. I remember the bliss I felt when I finally beat it, which seemed impossible to 4yo me.
I'm pretty sure I can farm lives on the first level with my eyes closed with how many times I've ran it
That one serious Sam level where you'd actually have to just hold S because there wasn't even time to turn around. The level would start and you'd immediately hear a big stone door closing.
One time my friend was playing some shitty 3D platformer made for kids that was distributed with cornflakes or some other shit and when he turned around and gone forward he just fell through the floor to limbo, lol.
Mega Man X6, Inifnity Mijinion's second part of the stage, also hid an armor piece and the heart tank by "going left" instead of right. Found that by complete accident one day, rubbing a cloth on the controller and dashing left