El reverso de la loseta tiene un comodín.

Reverso is a noun meaning the reverse side / the back of something, so el reverso means the reverse side.

• el reverso de la loseta = the back of the tile
• al revés is an adverbial expression meaning backwards, the wrong way round, or inside out, not a noun.

So in this sentence, you need a noun because you are naming a part of the object: the back side.

De is the usual way to express of in Spanish.

• el reverso de la loseta = the reverse/back of the tile

This structure is very common:

• la puerta de la casa = the door of the house
• el color del coche = the color of the car

Here, de la does not contract. Only de + el contracts:

• de + el → del
• de + la stays de la

So if the noun were masculine, you might get del, but with la loseta, it stays de la.

Loseta is a feminine noun. It usually means tile, especially a small flat tile such as a floor tile, game tile, or similar piece depending on context.

Because it is feminine singular, it takes:

• la loseta
• not el loseta

In games, loseta is often used for a cardboard or board-game tile.

Spanish uses definite articles much more often than English.

So El reverso de la loseta is the natural way to say The back of the tile. Leaving out el would usually sound incomplete in a normal sentence.

Spanish commonly says:

• La puerta está cerrada = The door is closed
• El libro es interesante = The book is interesting

Even when English might sound fine with less structure, Spanish usually wants the article.

Tiene is the third-person singular present form of tener (to have).

Conjugation of tener in the present:

• yo tengo
• tú tienes
• él / ella / usted tiene
• nosotros tenemos
• vosotros tenéis
• ellos / ellas / ustedes tienen

The subject here is El reverso de la loseta, which is grammatically singular, so the verb must be tiene.

Because the subject is the whole noun phrase El reverso de la loseta, and its head noun is reverso, which is singular.

A useful way to see it:

• main noun: reverso
• extra detail: de la loseta

So the sentence is really:

• The reverse side has a wildcard.

That is why the verb is singular:

• El reverso ... tiene
• not tienen

In Spanish, singular countable nouns usually need an article or determiner.

So:

• tiene un comodín = it has a wildcard / a joker

Without un, comodín would usually sound incomplete in a standard sentence.

Compare:

• Tiene una llave = It has a key
• Tiene un símbolo = It has a symbol

Comodín can mean different things depending on context, but the core idea is something flexible or substitutable.

Common meanings:

• in cards: joker
• in games: wildcard
• more generally: something that can stand in for something else

In this sentence, if it is about a game tile, wildcard is often the best interpretation. If it is literally about cards or a joker symbol, joker may fit too.

The written accent shows where the stress falls: co-mo-DÍN.

Without the accent, Spanish stress rules would suggest a different pronunciation. The accent mark tells you the final syllable is stressed.

So pronounce it approximately as:

• co-mo-DEEN

That accent is part of the correct spelling.

Yes, you could, and it would be understandable. But el reverso is more precise and concise, especially in formal, descriptive, technical, or game-related language.

Compare:

• el reverso de la loseta = the reverse/back side of the tile

  • more exact
  • good for written instructions or descriptions

• la parte de atrás de la loseta = the back part / the back of the tile

  • more everyday and less technical

So the original sentence sounds natural and slightly more precise.

Because the sentence is not saying on the back side; it is saying that the back side has something.

Compare the meanings:

• El reverso de la loseta tiene un comodín = The back of the tile has a wildcard
• En el reverso de la loseta hay un comodín = On the back of the tile there is a wildcard

Both can work, but they are structured differently:

• tiene focuses on what the reverse side possesses
• hay focuses on what exists there

So the original sentence is perfectly natural.

The structure is very straightforward:

• El reverso de la loseta = subject
• tiene = verb
• un comodín = direct object

So it follows a standard Spanish pattern:

Subject + verb + object

That makes it a very beginner-friendly sentence in terms of word order.

In Spain, this sentence sounds natural, especially in instructions, descriptions, or board-game contexts.

A speaker might also use alternatives depending on the object:

• La parte de atrás de la ficha tiene un comodín
• En el reverso hay un comodín

Whether someone says loseta or ficha depends on the type of piece:

• loseta often suggests a tile-like piece
• ficha can mean token, counter, piece, or tile depending on the game

So loseta is fine if the item is specifically tile-shaped.