Škola hrou: matematika, angličtina a zábava pro děti

A small React app where kids (ages 8–10) practice math and English through games. It runs entirely in the browser, with no backend. All progress is stored in localStorage.

Running it

npm install
npm run dev        # http://localhost:5173
npm run build      # type-check + production build into dist/
npm run preview    # serve the production build
npm test           # unit tests (Vitest)
npm run lint       # oxlint

What's inside

• Player profiles: each child picks a name and an animal avatar. Stars, points, records and the mute setting are saved per player.
• Home page: a panel for each subject, Matematika (/matika), Angličtina (/anglictina) and Zábava (/zabava). Each subject page lists its games. Games not built yet show as "Již brzy".

Matematika

• Four arithmetic games with the same modes: Násobilka (×), Sčítání (+), Odčítání (−) and Dělení (:, as Czech schools write it).
  • Násobilka and Dělení are practiced by table (×1 … ×10, :1 … :10). Dělení is the multiplication table read backwards, so every result is a whole number.
  • Sčítání and Odčítání are practiced by level: do 20, desítky (30 + 40), do 100 (no carrying / borrowing), přes 10 (with carrying / borrowing) and do 1000 (round tens, 340 + 250).
• Modes
  • Řada (tables only): walks through one table in order (1 × 6, 2 × 6 … 10 × 6). Solved rows stay visible as a ladder so the pattern shows. A wrong answer shows the right one, and the child types it again.
  • Trénink: 15 random questions from the selected tables or levels. Wrong answers come back at the end of the round.
  • Závod s časem: 60 seconds, as many correct answers as possible. The personal record is saved.

Angličtina

• Barvy (red, blue, green, yellow, orange, purple, pink, brown, black, white, grey) and Čísla 1–10 (one … ten).
• Jak se to řekne? (/vyber): 10 multiple-choice questions. The child sees the picture (a color swatch, or a number with dots to count) and picks the English word.
• Najdi barvu / Najdi číslo (/najdi): 10 multiple-choice questions the other way round. The child sees and hears the English word and picks the picture.
• Napiš: 10 words to type in English, with an on-screen keyboard. It shows the letter count, and 💡 Nápověda fills in the next letter, but then the word doesn't count towards stars. Capitals are ignored, and "gray" counts as well as "grey".
• Slovníček: the word list on each topic page. Click a word to hear it.
• Words are read out loud in British English with the browser's built-in speech synthesis (no audio files). It respects the mute button, and the 🔊 buttons hide where speech isn't available.
• Wrong answers come back at the end of the round, as in Trénink. Stars are saved per mode.

Zábava

• Tetris (/tetris): classic falling blocks on a 10 × 20 board, with a ghost piece showing where the piece lands and a preview of the next one. Pieces come in shuffled bags of all seven.

  • Controls: arrows ← → move, ↑ (or X) turns, ↓ drops faster, space drops at once, P / Esc pauses. Big on-screen buttons do the same on tablets. The game pauses when the tab is hidden.
  • Score: 100 / 300 / 500 / 800 × level for 1–4 lines at once, plus 1 per row of soft drop and 2 per row of hard drop. The level goes up every 10 lines and the pieces fall faster. Clearing 4 lines at once ("TETRIS!") sets off confetti.
  • Stars by lines cleared in one game: 5 = ★, 20 = ★★, 40 = ★★★ (best kept). The best score is saved as the record. Tetris score does not count towards the learning points (Body) on the home page.

• Piškvorky (/piskvorky): tic tac toe on a 3 × 3 board. Pick an opponent: the computer at Lehká (plays at random, but takes a win it sees), Střední (also blocks and takes the middle), Těžká (plays perfectly, so a draw is the best result), or Dva hráči on one device. Who starts swaps every game, and the score of the session is shown.

  • Stars against the computer (best kept): beat Lehká = ★, beat Střední = ★★, draw or win against Těžká = ★★★.

• Dino (/dino): a runner like Chrome's offline dinosaur, drawn on a canvas. The dino runs by itself and speeds up; jump over cacti (space, ↑, a tap on the board or the Skok button) and duck under birds (↓ or hold Skrčit). Birds come from 150 points, groups of three cacti from 100. A jump pressed just before landing still counts, and the hitbox is a bit smaller than the picture.

  • Score grows with distance (about 9 a second at the start), with a sound every 100. Stars by score in one run: 100 = ★, 300 = ★★, 600 = ★★★ (best kept). The best score is saved as the record.

• Pexeso (/pexeso): the memory card game. Pick pictures (Zvířátka, Jídlo, Doprava), alone or Dva hráči, and a size: Malé (6 pairs), Střední (8), Velké (12). Cards flip in 3D; a missed pair stays face up for a second. With two players a found pair earns another turn and a miss passes it on; whoever finds more pairs wins.

  • Stars when playing alone, per size, by moves per pair: ≤ 1.75 = ★★★, ≤ 2.5 = ★★, ≤ 3.5 = ★ (best kept). Two-player games are not saved.

Čas na hraní (play time)

The Zábava games are a reward. They are locked until the child earns play time:

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