Echoes — keyword mnemonic word game
Echoes teaches vocabulary the way memory actually works: through sound. Each card gives a word in your study language and a keyword in your own that sounds like it, plus a short scene linking the two. Guess the sound-alike, then lock in the meaning.
54 language pairs, covering 16 study languages from 14 native languages, so the mnemonic is built from words you already know.
Best for words that refuse to stick by repetition alone. Free to play in the browser.