All Resources Live

Visit the website for the lessons and printable word lists for all FlashBoss packs, including DLC.

About This Game

FlashBoss: Spaced Repetition and Boss Fights

Listen · Read · Repeat · Rate · Fight. A vocabulary course built around spaced repetition and boss fights. Foreign-language courses cover 3,000 of the most useful words, with naturally-structured example sentences, English translations, and high-quality text-to-speech audio on every card. English packs teach with definitions and two example sentences per card.

Each DLC contains 1,000 new vocabulary words, with many more related words taught in the notes field.

How it works

Each card sets a target word in example sentences at a level you can follow. Words come in thematic clusters, and every cluster is gated by a boss fight: win it and the cluster graduates — your deck gets smaller as you go.

Try before you buy

Full word lists for every pack, every reference lesson, and a playable boss-fight demo are free to browse on the website. Link in the right sidebar.

Two ways to play

Work the structured course at your master's pace — or skip the syllabus and just fight. Every tier you clear becomes a low-stakes boss rush, for unlimited revision.

Bank days off

Once the day's work is done, you can use a magic spell to bring tomorrow's workload forward — but be careful.

Boss fights

Each cluster ends in a duel: one step forward for a correct answer, two steps back for a mistake. As you practice flashcards, they are ranked in order of difficulty. The first two spaces offer you your easiest cards, and the latter two, the hardest. This means you cannot defeat a cluster without facing your biggest challenges.

Choose your master

Six masters set six daily paces — from Luna's 8 cards a day to Aquila's 34. Choose by temperament and time commitment.

Some masters are bossy: they cap boss fights at three per day to protect you from burnout. Others are advisory: they'll warn you it's a bad idea, then let you do what you want.

The packs

Four starter packs ship free:

• English Advance — the practical English of adult life: forms, letters, the fine print. 500 words.

• English Adept — sharper English for how you think, write, and speak. 1,000 words.

• German Core — the first 1,000 words of German, including a cultural integration section.

• Esperanto Core — one of the easiest languages to learn; 1,000 words goes far.

Further FlashBoss content:

• Latin Roots — build English vocabulary by recognising the parts that make the whole. 1,000 words over 500 cards.

• German Roots — the Germanic backbone of everyday English.

• Norman Roots — the French that arrived in 1066 and stayed.

• Greek Roots — the vocabulary of science and medicine. (in development)

• Full 3,000-word courses in German, Spanish, Italian, and Esperanto. A1–C1 content arc.

All English content in FlashBoss is American English.

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

AI was used in the coding of this game, the asset generation, brainstorming practical solutions (knowledge about opensource tts options, distribution options), and in helping problem solve most steps in the development, and application process. It allowed one developer to create a high quality, low cost educational product to greatly assist in language learning worldwide.