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The use of "when" at the end of a sentence in this context is simply asking when something will happen, with the connotation that they want that something to happen.

"This game is broken. Patch when?"

"I don't like my elected politician. Election when?"

"Spiders are flooding the Earth. Apocalypse when?"

It is absolutely intentionally incorrect grammar usage.

Edit: This usage is not typical in written or spoken English. Rather, based on my experience at least, this colloquial usage appears within online communities by younger generations. More specifically, it is found within online gaming communities.

I believe this usage to be the correct one given the context of the original question referencing the ASCII game Dwarf Fortress, which has cult-classic popularity online.

See these links as examples:
Half-Life 3
Black Desert Online
HOI4 Mod Kaiserreich
Apex Legends
Battlefield V

The use of "when" at the end of a sentence in this context is simply asking when something will happen, with the connotation that they want that something to happen.

"This game is broken. Patch when?"

"I don't like my elected politician. Election when?"

"Spiders are flooding the Earth. Apocalypse when?"

It is absolutely intentionally incorrect grammar usage.

Edit: This usage is not typical in written or spoken English. Rather, based on my experience at least, this colloquial usage appears within online communities by younger generations. More specifically, it is found within online gaming communities.

I believe this usage to be the correct one given the context of the original question referencing the ASCII game Dwarf Fortress, which has cult-classic popularity online.

See these examples:
HL3 when?
Sorc nerf when?
Nepal nerf when?
Wraith nerf when?
Support Class nerf when?

The use of "when" at the end of a sentence in this context is simply asking when something will happen, with the connotation that they want that something to happen.

"This game is broken. Patch when?"

"I don't like my elected politician. Election when?"

"Spiders are flooding the Earth. Apocalypse when?"

It is absolutely intentionally incorrect grammar usage.

Edit: This usage is not typical in written or spoken English. Rather, based on my experience at least, this colloquial usage appears specifically within online communities by younger generations.

I believe this usage to be the correct one given the context of the original question referencing the ASCII game Dwarf Fortress, which has cult-classic popularity online.

See these links as examples:
Half-Life 3
Black Desert Online
HOI4 Mod Kaiserreich
Apex Legends
Battlefield V

The use of "when" at the end of a sentence in this context is simply asking when something will happen, with the connotation that they want that something to happen.

"This game is broken. Patch when?"

"I don't like my elected politician. Election when?"

"Spiders are flooding the Earth. Apocalypse when?"

It is absolutely intentionally incorrect grammar usage.

Edit: This usage is not typical in written or spoken English. Rather, based on my experience at least, this colloquial usage appears within online communities by younger generations. More specifically, it is found within online gaming communities.

I believe this usage to be the correct one given the context of the original question referencing the ASCII game Dwarf Fortress, which has cult-classic popularity online.

See these links as examples:
Half-Life 3
Black Desert Online
HOI4 Mod Kaiserreich
Apex Legends
Battlefield V

The use of "when" at the end of a sentence in this context is simply asking when something will happen, with the connotation that they want that something to happen.

"This game is broken. Patch when?"

"I don't like my elected politician. Election when?"

"Spiders are flooding the Earth. Apocalypse when?"

It is absolutely intentionally incorrect grammar usage.

The use of "when" at the end of a sentence in this context is simply asking when something will happen, with the connotation that they want that something to happen.

"This game is broken. Patch when?"

"I don't like my elected politician. Election when?"

"Spiders are flooding the Earth. Apocalypse when?"

It is absolutely intentionally incorrect grammar usage.

Edit: This usage is not typical in written or spoken English. Rather, based on my experience at least, this colloquial usage appears specifically within online communities by younger generations.

I believe this usage to be the correct one given the context of the original question referencing the ASCII game Dwarf Fortress, which has cult-classic popularity online.

See these links as examples:
Half-Life 3
Black Desert Online
HOI4 Mod Kaiserreich
Apex Legends
Battlefield V