Here's a collection of screen-free activities that tween boys (ages 9 - 12) will go for! Hobbies, crafts, jobs, games, etc.
25 Activities for Kids ages 8-12 years old (made by teachers!)
Marble Genius Marble Run - Maze Track or Race Game for
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24 Fun After School Activities for Tweens (They'll WANT to Do)
Build a Craft Stick Chain Reaction! - Frugal Fun For Boys and Girls
50+ Unplugged Activities for Tween Age Boys - Frugal Fun For Boys