Learn Spanish (Latin America): Ese juego es muy popular.

In Spanish, muy means "very" and is used right before adjectives (describing words) like popular. You use mucho when you want to say "a lot" or "much" with nouns (like muchos juegos for "many games") or verbs.

Why is the word for "that" ese and not eso?

We use ese because it comes right before a masculine, singular noun (juego). eso is the neutral form of "that" which you use when you don't name the specific noun, like when pointing at something unknown and asking "What is that?".

Why use es instead of está for "is"?

We use es (from the verb ser) because being popular is treated as a core characteristic or defining quality of the game. está (from estar) is mainly used for temporary conditions, feelings, or locations.

Does the adjective popular change if it describes a feminine noun?

No! Adjectives that end in a consonant (like the r in popular) usually have the same form for both masculine and feminine nouns. If you were talking about a feminine noun like a party (una fiesta), it would still be muy popular.