will a spanish 7 year old understand how to play this

Well if they can speak English they will as a lot of the clues are in English..

Would this be suitable for a boy's 10th birthday please? His reading and writing skills are below average.

Not at all, I bought this for my cousin’s 8 year old and he loved it.

Would this be ok for two children age 8 and 5 to play between them or would they need a set each?

Depends if they are good at sharing! You can buy the small travel one 'On the Go Spy Mystery Secret Decoder ' to add to it. Comes with 3 pens 3 bookets with different mysterys to solve, so once one child has solved the page , other child wouldn't be able to do. So if you kids are easy going and can share, don't mind such issues , then I guess you wouldn't have a problem. Otherwise buy two. Probably best bet.

Is this too young for a 10 year old boy?

Boarder line. Depends on how switched on they are I reckon . As could see if a bit easy. First booklet: to solve the code using the decoder wheel and using the pen to colour in the blank spaces see answers. Second booklet is using red Len to see answers and work out the puzzle all fairly straightforward. Third booklet has a mixture of activities, bit of origami , blank space to write with invisible pen, code puzzles, decoding ,ways to write secret messages. It was a good present for child (a bright 7yr old ) as into such activities, but didn't take long to complete so longevity wasn't long. If child is quick to solve problems and finds things quite easy , then im guessing probably not the best for a bright 10 year old.

Melissa And Doug Secret Decoder Role Play Detective Kit Spy

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Description

🕵️‍♀️ Unlock the mystery, join the elite squad of young detectives!

ECO FRIENDLY FUN - Crafted with FSC-certified materials supporting responsible forestry—play with purpose.
DECODE LIKE A PRO - Crack secret codes and reveal hidden messages with the exclusive red-lens decoder.
ALL IN ONE SPY KIT - Includes 3 interactive books plus spy gear like magic reveal stickers and magnifying glass.
BRAIN BOOSTING PLAY - Over 50 activities designed to sharpen problem-solving and critical thinking skills.
ULTIMATE TRAVEL COMPANION - Compact, screen-free fun perfect for plane rides and long car journeys.

Melissa & Doug’s Secret Decoder Deluxe Kit is a 3-in-1 kids activity set featuring over 50 puzzles and spy tools like a magnifying glass and magic reveal stickers. Designed for ages 7-9, it promotes screen-free imaginative play, critical thinking, and problem-solving. Perfect for travel and crafted with FSC-certified materials, this kit is a top-rated educational gift that transforms downtime into thrilling detective adventures.

Specifications

ASIN	B00O2JUVRM
Age Range Description	7 - 10 years
Best Sellers Rank	104,406 in Toys & Games ( See Top 100 in Toys & Games ) 28 in Detective Toys & Sets
Brand Name	Melissa & Doug
Colour	Multicolor
Customer Reviews	4.6 4.6 out of 5 stars (1,916)
Educational Objective	To enhance problem solving, critical thinking, and creative thinking skills
Global Trade Identification Number	00000772152389
Included Components	3 unique activity books (Secret Decoder, Seek & Find, and Secret Message), 2 magic-reveal sticker sheets, 2 decoder wheels, 2 color-change markers, invisible-ink marker, search-and-find lens
Indoor Outdoor Usage	Indoor
Is Assembly Required	No
Item Dimensions	15 x 170 x 254 millimetres
Item Type Name	Arts & Crafts
Item Weight	0.56 Kilograms
Manufacturer	Melissa & Doug
Manufacturer Part Number	15238.0
Manufacturer Warranty Description	No Warranty
Manufacturer recommended age	7 - 10 years
Material Type	Paper
Model Number	15238.0
Number of Packs	11
Number of Players	1 US
Operation Mode	Manual
Power Source	manual winding
Set Name	Secret Decoder Deluxe Activity Set
Size	20 x 20 x 20 centimeters
Subject Character	Secret Decoder Deluxe Activity Kit
Supported Battery Types	No batteries required
Theme	['Spy', 'Detective']
UPC	681147001350 000772152389
Unit Count	1 Activity Set

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Melissa & Doug Secret Decoder Role Play Detective Kit | Spy Game for Kids | Age 7-9 - FSC Certified

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