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Sky Learning Studio
Rock Castle Solutions LLC

Learning is more fun when it feels like play.

Sky Learning Studio makes playful Japanese–English games for anyone learning Japanese — from first words to stronger reading, recall, and confidence.

5 apps in the series
Japanese + English, side by side
For learners of every age
Our mission

Learning Japanese takes practice. It shouldn't feel joyless.

Japanese can be easy to lose momentum with. Vocabulary lists pile up, reading feels slow, and practice starts to feel like one more task. That is when even a curious learner can begin to pull away.

We think the answer is not simply more drilling. It is giving Japanese a place learners already want to return to: inside a game they would choose on their own.

Every game in the series moves between Japanese and English by design. Not a translated version — one game, two languages, side by side. Whatever your age or starting point, you play, the switching becomes more natural, and the horizon gets wider.

1

Play first

If it isn't fun in the first thirty seconds, it isn't finished. Learning rides along inside the fun, never bolted on top.

2

Both languages, together

English and Japanese appear in the same play session, so switching between them becomes a reflex instead of an event.

3

Practice without pressure

Mistakes are part of the round, not a reason to stop. Feedback stays clear and gentle, so it is easy to try again.

4

Broader horizons

Two languages means two ways of seeing. We build for the curiosity that comes with that, not just the vocabulary.

The series

Five apps, one idea

Whether you are beginning, returning to Japanese, or building speed, each game keeps English and Japanese in the same play session. The challenge changes, but both languages stay together.

Drive Go Go app icon

Drive Go Go

Learn words. Drive further. Have fun.

A gentle driving-and-spelling game for beginning learners. A word appears with one letter missing — collect the right letter from the road while you drive.

Letter recognitionEarly spellingHiragana practice
Learn moreiOS
Bilingual Samurai app icon

Bilingual Samurai

Slice the spelling.

A fast slicing game. A word appears, letter and kana tiles fly up from below, and you slice them in the right order before time runs out.

Kana spellingReading speedVocabulary recall
Learn moreiOS
Bilingual Ninja app icon

Bilingual Ninja

Master words. Outsmart the oni.

A maze game. A word appears with blanks in it — find the letters that fill them, in order, while oni patrol the maze.

Spelling under pressureRoute planningEN ⇄ JA switching
Learn moreiOS
Kotoba Quest app icon

Kotoba Quest

Match words. Meet new worlds.

A bilingual memory adventure you can enjoy solo or online with friends. Flip cards, connect English words with their Japanese twins, and travel through playful word worlds with a new companion in each one.

Bilingual word matchingVisual memoryEnglish–Japanese recall
Learn moreiOS
Word Fall app iconComing Soon

Word Fall

Make words. Clear the sky.

A falling-letter puzzle for learners building fluency. Guide two-letter pieces into an 8 × 12 board, then make words across and down to clear the sky.

SpellingHiragana practiceWord building
Learn more
TwinkleTouch app iconComing Soon

TwinkleTouch

A little world of light and sound.

Calm, touch-driven sensory play for babies and young children. Taps and finger trails create glowing stars, colorful ribbons, and soft musical sounds.

Cause and effectVisual trackingTouch exploration
Learn more
See all apps

The series keeps growing. New apps join the same family: playful first, bilingual by design, gentle with mistakes.

AI tutor concept

A patient practice partner between Japanese and English.

We are exploring how a future tutor could connect words across our games, adapt between Japanese and English, and make speaking practice feel more approachable. We are equally serious about what it should never do.

Read the concept
Made for real life

Easy to pick up. Easy to fit into your day.

Play without the pressure

Short rounds, clear goals, and gentle feedback make it easy to practise for a few minutes or stay for a higher score.

One-time unlocks, never subscriptions

You can try our apps for free. When an app offers more content, it is a single purchase through the App Store or Google Play — it never expires and never renews.

Privacy-minded by design

Our apps ask for no Sky Learning Studio account, and progress is saved on the device. Optional Game Center features are handled by Apple when you choose to use them.

Practise almost anywhere

Core solo play works offline once installed. Rounds finish in a few minutes, so Japanese practice can fit into a commute, a break, or a quiet moment at home.

Questions, bug reports, or an idea that would make practice better? We read every message.

Contact us
About the studio

Sky Learning Studio

Sky Learning Studio is the game studio of Rock Castle Solutions LLC. We build small, focused games for people learning Japanese at every age and stage — from first words to faster reading and stronger recall.

We are not trying to replace classes, tutors, books, or conversation. We are creating another welcoming place to meet Japanese, practise it, and enjoy coming back to it.

Operated by Rock Castle Solutions LLC

Studio
Sky Learning Studio
Company
Rock Castle Solutions LLC