Every noun with its article. Every word with a full sentence.
Every German noun carries a gender — der, die or das — and there is very little in the word itself to tell you which one it is. "Das Wasser" is neuter, "die Reise" is feminine, "der Nachbar" is masculine, and no rule connects them. This is the single biggest reason learners stall after the first few weeks.
That is why every German word in this game is shown with its article attached. You never learn "Wasser". You learn "das Wasser", as one unit, the way a child does. Learning the noun first and the gender later is twice the work, because you then have to unlearn a habit.
Look at the example sentence that appears after each answer. In "Ich kaufe jeden Morgen Brot", the verb sits in second position. Move something to the front and the verb stays put while the subject jumps behind it: "Jeden Morgen kaufe ich Brot". English does not do this, and a word list alone will never show it to you. A full sentence will.
Separable verbs do something similar. The pieces of the verb drift to opposite ends of the clause, which is why a sentence can seem to end in a word with no obvious job. Seeing this happen in a real sentence, over and over, teaches it far better than a grammar rule does.
If you are already here and working, you probably do not have three free evenings a week for a course. That is a real constraint, not laziness. Ten words in a break is a schedule that survives contact with a full week; two hours on Sunday is a schedule that collapses the first time Sunday gets busy.
Set the language you speak at the top — English, Punjabi, Hindi, Turkish, Spanish and five others are available — and the game teaches German from there. Learning German through your strongest language is faster than learning it through your second-strongest.
Once a set of words feels easy, change the language you speak so that German becomes the source. Going from German back into your own language is noticeably harder, because recognising a word and producing it are two different skills. If you can do both directions, you actually know the word.