There are 22 Card Carnival Challenge Puzzles in Final Fantasy 7 VII Rebirth. They are found in Costa del Sol. The first 7 are unlocked in Chapter 6, the remaining 15 are unlocked in Chapter 12.

They unlock various Queen's Blood Cards which are useful to build a better card deck.

Doing the Chapter 6 Card Carnival Challenges is needed to solve the main objective "Card Carnival". They are little Queen's Blood Card Puzzles that require you to place cards in a specific order and in specific positions to win.
You can still do them after the story via Chapter Select, at the start of Chapter 13 when you have access to the full open world.

TEXT SOLUTIONS:
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TIMELINE ALL CARD PUZZLE SOLUTIONS:

CHAPTER 6:

1 - Cards Del Armor Challenge Round 1 - 0:00
2 - Cards Del Armor Challenge Round 2 - 1:05
3 - Cards Del Armor Challenge Round 3 - 1:41
4 - Spears and Needles - 2:24
5 - Sea Devil by Night - 2:59
6 - A Kingly Clash - 4:02
7 - Power-Down Practice - 5:01

CHAPTER 12:

8 - One Shot, One Kill - 5:34
9 - Curse of the Gi - 6:40
10 - Collector’s Card: Cloud - 7:47
11 - Collector’s Card: Barret - 8:32
12 - Collector’s Card: Tifa - 9:27
13 - Collector’s Card: Aerith - 10:14
14 - Collector’s Card: Red XIII - 11:03
15 - Collector’s Card: Yuffie - 11:59
16 - Collector’s Card: Cait Sith - 12:58
17 - Collector’s Card: Cid - 13:52
18 - Collector’s Card: Vincent - 14:46
19 - Chain Reactions - 15:35
20 - Major Power Outage - 16:10
21 - Back to Replace-ics - 16:47
22 - Replacement Test - 17:26

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