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Forced to watch ads or given rewards for watching ads.

Many games, especially free-to-play games, contain advertising. Instead of paying for the game with money, you pay for it with your attention. People are more willing to part with their attention than with their money, and often aren't aware of how much time they are giving to these in-game advertisements.

Advertisements by themselves are not necessarily a Dark Pattern, but they can become one if they are made too intrusive and interrupt normal gameplay too frequently. For example:

1) Ads that cannot be skipped.
2) Giving rewards for watching ads.
3) Tricking you into clicking on an ad by placing it in a place where you might accidentally click on it.
3) Disguising an ad to make it look like part of the game.

Games can sometimes treat watching an ad as a form of in-app currency to enable other dark patterns. For example, some games allow you to replenish your energy by watching an ad. This is a form of Pay to Skip where you are paying with your attention instead of money.
Citations and SourcesUXP2 Dark Patterns
Disguised Ads


Examples

PewDiePie's Tuber Simulator PewDiePie's Tuber Simulator
"Ads can be watched for rewards, but are never forced"

The Battle Cats The Battle Cats
"The game allows you to watch advertisements to replenish energy or obtain cat food, although never forces you to do so."

Boom Beach Boom Beach
"Other Supercell Games"

Talking Tom Gold Run Talking Tom Gold Run
"very much so"

Soul Knight Soul Knight
"The other games of the developper"

Magic: The Gathering Arena Magic: The Gathering Arena
"They often advertise their in-person paper events, link to their site for set pre-orders and sometimes link to other IPs by Hasbro."

Clash of Clans Clash of Clans
"Supercell advertise their other games and projects in the app."

Block Blast-Block Puzzle Games Block Blast-Block Puzzle Games
"Yeah, like 1 per 5 minutes."

Phobies Phobies
"You can gain beans by watching ads"

Krunker Krunker
"Banner ads when not spawned in, or when you want to double your xp."