隠かくし機き能のう

noun

Easter egg; hidden feature

Computing term for an undocumented feature or surprise hidden in software, games, or websites.

• このゲームには隠かくし機き能のうがいくつかある。

  This game has several Easter eggs.

• 開かい発はつ者しゃはアプリに隠かくし機き能のうを仕し込こんだ。

  The developer put a hidden feature into the app.