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German plurals don't follow a single rule, which is why many learners end up guessing. These free games let you do hundreds of plural reps per session, which can help the patterns settle in.
There are five main German plural patterns: -e (der Hund → die Hunde), -en (die Frau → die Frauen), -er with umlaut (das Kind → die Kinder, das Haus → die Häuser), -s for loanwords (das Auto → die Autos), and zero ending often with umlaut (der Apfel → die Äpfel). No single rule predicts which noun takes which pattern.
Native speakers rarely state the plural rules explicitly, but they use productive patterns they have heard countless times in context. The patterns are tendencies with plenty of exceptions, so learn each noun with its article and its plural: der Tag - die Tage. One practical way to approximate that without spending years in Germany is to drill plurals at high volume under light time pressure. Arcade-style game formats can fit many more reps into the same minute than a typical textbook exercise.
Five main ones: -e, -en, -er (often with umlaut), -s, and zero ending (sometimes with umlaut, and common with diminutives such as das Mädchen - die Mädchen). They are tendencies, not rules, so store each noun as der Tag - die Tage and do plenty of reps.
Try learning the plural alongside the noun and article (das Haus, die Häuser) as a single chunk, then drill those chunks under light time pressure so retrieval starts to feel automatic. Memorising rules without reps rarely sticks on its own.