Nine worlds.
One deck.
Math at light speed.
Every card is a real world of the solar system — Jupiter is 5, Neptune is 8. See it, solve it, say it. Classic War, with the solar system built in.
Real planet photography · self-checking · classroom & homeschool ready
Two cards flip. Multiply to win them both.
Battle the Worlds
Every card is a world of the solar system. Read its orbit from the Sun — Mercury is 1, Pluto is 9 — then multiply the two. Sixty seconds on the clock.
The Skills Yard
Six fast drills off the same nine-world deck — division, subtraction, estimation, nerve, sums of ten, and doubling. Pick a yard, hit start, and climb the ranks.
How to play
Numbers wear planets. Your brain does the counting.
- 1
Decode the planet
See a world, recall its order from the Sun. The planet is the clue; its number is the answer.
- 2
Battle the values
Two cards flip. Multiply the orbits — Jupiter × Earth is 5 × 3 — and the first to shout 15 wins both.
- 3
Take the pile
Win rounds, take cards. Most cards wins the war. Flip a wild and you add it instead. Younger players switch to the Skills Yard — division, subtraction, estimation, nerve, sums of ten, and doubling, all off the same deck.
At Admiral rank, a cosmic wild flips the battle from multiply to add. Jupiter 5 + Moons of Jupiter 95 = 100 — you add the wild's big number instead of multiplying. The card turns violet so you always see the switch coming.
The Planet Key
Each card's value is its order from the Sun — learn the order once and you read the whole solar system on sight.
★ Cosmic Wild Cards ★
Real space numbers carry big bonus values. At Admiral rank a wild flips the battle to addition — add its value to the world it meets.
The stories behind the planets
Every world carries its own myth, record, and mystery — from the swiftest orbit to the windiest storms.
1MercurySwift Messenger
The smallest planet and the closest to the Sun — named for the swift Roman messenger god. A year on Mercury is just 88 Earth days, the fastest lap in the solar system.
2VenusMorning Star
The hottest planet of all, wrapped in thick clouds that trap heat. Brilliant at dawn and dusk, it earned the name "Morning Star." Named for the Roman goddess of love.
3EarthHome World
Our home — the only world known to hold life, liquid water, and breathable air. The third rock from the Sun, and the only planet not named for a god.
4MarsRed Warrior
The Red Planet, rusted by iron in its soil and named for the Roman god of war. Home to the tallest volcano and the deepest canyon in the solar system.
5JupiterGas Giant
The giant — so big that all the other planets could fit inside it. Its Great Red Spot is a storm wider than Earth that has raged for centuries.
6SaturnRinged Lord
Famous for its dazzling rings of ice and rock. Though it is the second-largest planet, it is so light it would float in water — if you found a big enough ocean.
7UranusIce Tilter
The tilted world — it spins on its side, so its poles face the Sun. A pale blue-green ice giant with faint vertical rings.
8NeptuneStorm King
The farthest true planet, and the windiest — its storms howl faster than the speed of sound. A deep blue ice giant discovered by math before it was ever seen.
9PlutoDwarf Heart
Once the ninth planet, now the most famous dwarf planet. Its icy surface carries a giant heart-shaped plain, and it takes 248 Earth years to orbit the Sun once.
Four printable decks · nine worlds · four cosmic wilds · a 150-problem workbook
Bring Space Wars to the table
The printable deck is the heart of Space Wars — a fast, face-to-face card battle for two or more players. The game above is a warm-up; the real fluency comes from the tabletop.
Number Battle
Multiply or add the orbits — first to shout the answer wins the pile.
Skills Yard
Six drills off one deck: division, subtraction, estimation, nerve, sums of ten, and doubling.
What's inside
- Four skill tiers
- Nine planet cards
- Cosmic wild cards
- Planet stories
- 150-problem workbook
- Answer keys + certificate
Ages 7+ · Grades 3–9 · Science · Astronomy · Multiplication