Can you find the winning line?

Hardcore Nuzlocke, final fight, one Pokémon left. It is not the one you wanted. Every other option fainted three gyms ago and there is no box to fall back on.

Gen 5 OU battle. Volcarona tries to sweep past a bulky Water.

One Pokémon. Four opponents. No switching, no backup, no items in the bag. The purest form of the challenge run, and it comes down to whether you understand your own moveset better than the AI understands its own.

Gen 6 OU battle. Mega Charizard X faces Aegislash.

Modern VGC restricted doubles. Two legendaries a side, open teamsheet, and a speed tier that punishes one wrong click. This is what current-format play actually demands.

Truant gives you every other turn. That is the entire puzzle, and it is not as generous as it sounds. Emerald Kaizo's Norman, in Gen 3 mechanics.

A battle I came across in the ROM hack Freezai's Mountain. There were several false leads, but the correct strategy was pretty interesting when I figured it out.

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Monotype challenge: your whole team is Water, and you have walked directly into the Grass gym. This is the fight monotype runs are actually decided by.

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Gen 5 doubles, permanent rain era. Drizzle plus Swift Swim was strong enough that it shaped an entire generation of competitive play. Here is what it felt like from the wrong side.

Modern VGC restricted doubles. Two legendaries a side, open teamsheet, and a speed tier that punishes one wrong click. This is what current-format play actually demands.