The 10 Best 9 Year Old Boy Gifts

Space fans get a model with a real trick in the LEGO Technic NASA Artemis SLS. Turning a hand crank splits the rocket into its three stages, like the real one shedding boosters on its way to the moon. NASA and the European Space Agency helped shape the design, and tiny astronauts wait by the tower. With a 9+ label, it's a build most kids finish alone. It's meant for a shelf, not rough play.

Kids curious about what makes things light up and buzz get a friendly start with the Snap Circuits Jr. SC-100. Each part is a piece of a real circuit on a plastic base that snaps onto a grid like a jacket button, so there's no soldering and no tools. A color manual walks through more than 100 builds, including a fan blade that flies off its motor. It runs on AA batteries that aren't in the box.

Puzzle lovers who like a challenge that grows with them can start with the ThinkFun Gravity Maze. Each card shows a few clear towers already in place, and the player adds the rest so a marble drops from the start all the way into the target. The 60 cards climb from warmups to brain-benders that stump grown-ups, and the answers are printed on the back. Once every card is solved, it tends to stay on the shelf.

The fun of the Smartivity Pinball Machine comes twice: first in building it, then in playing it. Pre-cut wooden parts pop out of sheets and go together from picture instructions with no glue or tools, and Smartivity says the build takes about three hours. The finished table has a spring launcher, flippers and scoring targets, and the maker replaces lost or broken parts for free. The pressed-wood pieces need gentle hands and a dry spot to live.

Every rock in the National Geographic Break Open Geodes kit is a surprise until it cracks. The box holds ten real geodes, along with safety goggles, a magnifier, display stands and a guide that explains how crystals grow inside hollow stones. There's no hammer, so you'll need one from the garage, and a grown-up should stay close while chips fly. A few geodes turn out solid or plain inside, which is simply how natural rocks go.

Backyard games get a lot livelier with the Spikeball Original Set. Teams of two take turns smacking a small ball down onto a round, trampoline-style net, and it works on grass, sand or a gym floor. The kit packs the net, three balls and a carry bag, and Spikeball covers sets with a one-year warranty. The plastic frame pieces can crack with hard use, and the maker also sells a Rookie Set with a bigger ball for young beginners.

Car fans who want a quick, satisfying build will like the LEGO Speed Champions Ferrari SF90. It copies the hybrid SF90 XX Stradale supercar, with the tall rear wing, the cab-forward shape and the high tailpipes, and a driver figure in a team suit and helmet fits in the single seat. It makes a good add-on gift for a kid who already collects cars. It's done in an afternoon, so it won't fill a long weekend.

The Qunreda Q1 Stunt Car is a tough little remote-control car that flips, spins and keeps going upside down. With just two buttons on the remote, kids learn it in seconds. It runs on a pair of small battery packs that pop out and charge from a phone cable, so one can charge while the other drives. Qunreda is a little-known brand, and a few cars have lost a wheel motor within months.

Long throws are the whole point of the Nerf Vortex Aero Howler, a foam football with a finned tail that helps small hands throw a tight spiral. Holes in the body make it whistle in flight, so it's easy to follow against the sky. The soft foam won't sting on a missed catch, which makes it fine for younger siblings too. It sails a long way, so a small yard can lose it to the roof or the neighbors.

David Macaulay's The Way Things Work explains machines with drawings a curious kid can pore over for years. A herd of woolly mammoths leads readers from simple levers and gears to lasers, touchscreens and wireless internet, and each spread breaks one idea into small, clear steps. This revised edition adds the digital world to the 1988 original. It's a big, heavy hardcover with busy pages, so it's for dipping into rather than reading cover to cover.