Words 21 to 40 of the 1,500 Fuguro teaches. Each level builds on the last, so they are best learned in order. Open any word for its reading, meaning, an example sentence with furigana, and a note on how it is used.
Fuguro teaches level 2 in short lessons. Every word has audio, comes back for review right before you forget it, and shows up again in stories you can already read. The first five levels are free, and reviews stay free forever.