What comes after 1 in Brain Test 4 Level 273?

The intended answer is a question mark, because what comes next is presented as a mystery.

Where do I get the question mark?

Drag the existing question mark from the end of the prompt at the top of the screen.

None of them. Drop the question mark onto the middle 5 instead.

Brain Test 4 level guide

easy 5 colors

Brain Test 4 Level 273 is solved by dragging the question mark from the prompt onto the middle 5, turning the row into 3, question mark, 7.

If the player asks you to sign in, open the video on YouTube instead.

Find the question mark at the end of the sentence near the top of the page.
Press and hold the question mark until it detaches from the prompt.
Drag it downward toward the center of the three number cards.
Place it directly over the card labeled 5.
Release it and wait for the row to read 3, question mark, 7 and show the green check.

Colors in this level:

White, Black, Green, Pink, Yellow

Tapping one of the visible numbers as though the puzzle were multiple choice.
Trying to calculate the next odd number instead of interacting with the sentence.
Dropping the question mark beside the cards rather than on top of the 5.

Board notes 5 details

Layout: The prompt asks what comes after 1 above three centered cards labeled 3, 5, and 7.
Goal: Use the prompt's movable punctuation to replace the middle number with an unknown value.
Opening: Press the question mark at the end of the sentence instead of tapping any number card.
Danger Zone: The three numbers look like answer choices, but selecting or reasoning from them misses the draggable object hidden in the prompt.
Mechanics: Text punctuation acts as a movable object and replaces the numeral beneath it when dropped on the center card.

What comes after 1 in Brain Test 4 Level 273?
The intended answer is a question mark, because what comes next is presented as a mystery.
Where do I get the question mark?
Drag the existing question mark from the end of the prompt at the top of the screen.
Which number should I tap?
None of them. Drop the question mark onto the middle 5 instead.