This is a simple game, that can improve Japanese reading, typing, grammar, and knowledge in general.
One person will start with a single word, and the next person will reply with a word to continue the story.
Grammar will be difficult, but basically, if the grammar applies to the word you post you can attach it to that word, but if you choose not to, the next person can add it before their own word.
Grammar mistakes are acceptable.
Example:
Someone starts with 私は
next person continues story as normal
or
Someone starts with 私
next person can choose to start their word with は(word).
I’ve never seen this game done in Japanese, so this is experimental, the rules are rough, and the execution is likely going to be messy, but hey, you live, you learn.