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Games

Learning games that teach before they test.

S3U games are built around strategies, clues, feedback, review, and practice so scores show learning instead of becoming the whole point.

Filter by subject, level and skill

A delivery robot follows instruction blocks past three parcels toward a green dock.

Route Coder

Build and test twenty-seven robot programs. Stop at the first match, count or filter orders, find the largest, and trace lists, loops, helpers and returned answers across changing routes.

Start coding
Red and white checkers and a crowned king on a green board.

Checkers Club

Learn six jump puzzles and ten strategy plans. Compare capture choices and new crowns, play the computer or a partner, and replay your moves. English/American rules.

Play checkers
Three colorful bookmarks on a green shop shelf.

Market Workshop

Stock a pretend shop with earned coins. Compare prices, serve system customers, and see why revenue and profit differ. No real money or player trading.

Open your shop
An ascending suit and an alternating-color card run.

Solitaire Studio

Learn with six rule puzzles and six planning challenges. Compare alternate routes, uncover cards and replay your choices in Draw-One Klondike.

Play solitaire
A white knight and dark king on a green chessboard.

Chess Workshop

Meet the pieces in twelve positions, then try twelve strategy and endgame plans: tactics, rook and knight promotions, king-and-rook teamwork and avoiding stalemate. Play untimed games and replay your choices.

Learn chess
An illustrated computer workbench with keyboard, screen, CPU, RAM and storage.

Computer Crew

Sort computer jobs, follow saved copies, compare capacity and match build requirements. Six challenges with illustrated records and explained answers.

Build your crew
An illustrated workshop with cargo, gears and a signal tower.

Text Workshop

Repair cargo notes with selection, copy, cut, paste, undo and redo. Three hands-on routes include a five-job dispatch desk, with hints and retries.

Open the workbench
Project folders, a dispatch shelf and an archive connected by a file delivery trail.

File Quest

Create folders, deliver whole exhibits and protect earlier records. Twelve pretend-file missions with hints and a safe place to try again.

Start a file quest
Numbered message pieces traveling between relay stations and buildings.

Packet Post

Route messages around a broken link, compare travel times and rebuild a mixed-up inbox. Six hands-on deliveries.

Start delivering
A workshop laptop and Archive connect through a two-interface router to Atlas and Mirror at an observatory.

Network Workshop

Fourteen hands-on repairs explore addresses, gateways, subnet masks and DNS caches. Compare an old answer with its source, advance model time and check the page service.

Start a network repair
Two fictional radar records show a patch shifting northeast beside a separate ground gauge.

Weather Desk

Compare fictional forecasts, radar, rain totals and weather stations. Nine guided cases with a labeled notebook and explanations.

Open Weather Desk
A bag of labeled star and circle tiles beside mixed draw results.

Chance Lab

Count two-draw paths, compare events, and discover how a clue changes the counting group. Thirteen probability discoveries with an observation board.

Open Chance Lab
Crescent, quarter and full views of the same-sized Moon disk.

Moonlight Lab

Predict Moon views, compare waxing and waning, turn a drawing and investigate an eclipse. Six guided discoveries with hints and an observation board.

Open the Moonlight Lab
Red and green light channels make a labeled yellow sign while blue is off.

Color Lab

Mix screen light, compare readable signs, build flag palettes and investigate fictional paint records. Fifteen guided investigations with hints and free retries.

Open the color lab
A kite, blue box and picnic map beside word tiles and punctuation marks.

Sentence Studio

Build a picnic story in nine word-tile missions. Keep meaning clear, contrast ideas, order events and punctuate a packing list.

Open the sentence studio
An original notebook, copied claim and correction connected on an evidence desk.

Source Desk

Inspect eighteen museum case files. Trace copied claims, compare historical viewpoints and check cropped pictures, later captions and map keys.

Open the source desk
A Moon Museum poster with Mira the reader, Ari the artist, Theo and a forwarded-link visitor.

Sharing Studio

Prepare a moon museum poster for the right audience. Try reader and editor roles, untangle sharing routes and protect the original in six pretend jobs.

Open the sharing studio
Three account stations and a sign-in key beside two separate device routes.

Account Safety Lab

Repair six fictional account situations. Test unique secrets, sign-in factors, suspicious prompts and shared-device sessions without entering real passwords.

Enter the safety lab
A build workbench, test gate, preview tower and live beacon with a separate recovery sandbox.

Release Lab

Build, test and send pretend software through eleven release missions. Compare failure rates, restored contents and two recovery goals while preserving current records.

Enter the lab
Two equal whole frames on a ferry, one filled by halves and the other by thirds.

Fraction Dock

Build, compare, calculate and locate fractions on six ferry routes. Keep the whole fixed, compare with half and one, and explain the gaps on either side.

Open the dock
A pretend register, four labeled coin values and a receipt checking price plus change against payment.

Cash Counter

Count coin values, find different ways to pay, and check the change. Six pretend shop jobs with hints and printable practice.

Open the counter
Two resistor paths and switches connected to a model source, beside a comparison notebook.

Circuit Bench

Compare current, voltage, power and whole-network resistance. Seventeen experiments explore source changes, switch gaps and equivalent routes.

Open the bench
Input signals pass through OR and AND blocks to a station beacon.

Signal Station

Build logic signs, then add binary bits with Sum and Carry outputs. Eleven guided discoveries with full truth tables, hints and retries.

Enter the station
A latch follows data while a flip-flop holds its earlier bit without a new clock edge.

Signal Memory

Give a circuit a memory. Compare an enable-controlled latch with rising-edge storage, predict every case and trace the changing bits.

Open the memory lab
A final e changes cap to cape beside an at word-family shelf.

Spelling Lab

Choose word families, endings, words in sentences, word roots or silent letters. Five six-station paths with spoken examples, meaning clues and gradually reduced support.

Open the lab
A number workshop with gears, a conveyor and a signal tower.

Rule Patrol

Sort number cargo, compare different rules, then investigate review flags. Use independent evidence to spot false alarms, missed errors and unresolved records.

Start patrol
Colorful cargo including a rocket, robot, book and planet.

Cargo Compare

Compare cargo grids and scan lists. Investigate swaps, shapes, color labels, quantities, empty spaces, changed order and repeated labels.

Inspect the cargo
A rocket, robot, flower, kite and planet in an explorer collection.

Memory Expedition

Study a colorful collection, tuck it away, then remember its objects and their spots. Five fresh collections every expedition.

Start remembering
A magnifying glass, flask and discovery token.

Unbelievable Facts

Catch surprising truths and misleading claims. Collect eight discoveries and inspect the evidence.

Enter the curiosity lab
Tiny cats among colorful harbor shops, trees and gardens.

Cat Harbor

Twelve little cats have found cozy spots around the harbor. A counting and observation adventure.

Find the cats
Hidden rockets across an illustrated lunar outpost.

Rocket Outpost

Explore the moon base and recover twelve miniature rockets hiding near domes and solar stations.

Find the rockets
Small cars tucked around a town with roads, shops and gardens.

Car Town

Search a busy little town for twelve parked cars, from the school to the repair shop.

Find the cars
Seedlings on a hillside beside a red barn.

My Farm

Invest earned coins in seeds and compost. Tend your crops every few days, earn responsibility points, and sell your harvest.

Visit your farm
The floating observatories and orbital islands in Math Missions.

Math Missions

Pilot your ship through five floating islands. Build energy supplies, repair each station, and light the way home.

Start expedition
Gears, a conveyor and a signal tower in the pattern workshop.

Pattern Builder

Look for the rule first, then use feedback to strengthen pattern thinking.

Play
A garden trail with a map, flowers and a pond.

Reading Quests

Choose from eight passages: stories, instructions, archive sources and visitor records. Try worked reading moves and trace each answer to supporting sentences.

Play
A garden trail with a map, flowers and a pond.

Word Builder

Use context clues to build vocabulary instead of guessing isolated words.

Play
A microscope, experiment flasks and an evidence notebook.

Science Lab

Choose science records, food webs or digestion routes. Three five-stop investigations pair illustrated models with worked examples, hints and worksheet links.

Play
A microscope, experiment flasks and an evidence notebook.

Evidence Sorter

Investigate five illustrated records: compare growth, repair a test, find an exception and keep unknown results open.

Play
A story stage with curtains, scenery and spotlights.

Creativity Studio

Explore five illustrated revision moves: keep facts, question assumptions and give a reader the missing piece.

Play
A story stage with curtains, scenery and spotlights.

Idea Mixer

Explore five illustrated writing targets: action, place, obstacle, sound and result. Then make a scene of your own.

Play
A chain of explorer islands with a compass and landmarks.

Map Explorer

Explore six illustrated geography records with worked examples, hints, fun facts and printable worksheet links.

Play
A chain of explorer islands with a compass and landmarks.

Region Clues

Match physical and human geography clues to the idea they show.

Play

Practice should explain what is happening

Each game should help students notice strategies, see feedback, and build confidence before the score is saved.