This program is meant to be used on a desktop or laptop computer.
Try it with the cards already loaded (European countries and capitals) and try all the buttons to see how it works.
If you get stuck just refresh the page.
Make your own cards on a spreadsheet with questions in column A and answers in column B.
Copy the two spreadsheet columns (Ctrl+C), hit the Clear button below and paste (Ctrl+V) your cards there.
Pasted cards are tidied up automatically: empty rows and extra spaces are removed, and a cell with several lines becomes one line.
A card is one line: a question and an answer separated by a tab. Inside the card boxes the Tab key types a tab.
Cards are not saved: when you close the page they are gone. Keep your cards (and the Learned list) in your spreadsheet.
Keyboard, while you are not typing in a box: Space flips the card, → is NEW, ← is BACK.