N2 — outside your level filter
write + (past) + worth the effort of
kaita kaigaaru
worth the effort of; the effort paid off
meaning: it is worth writing
三年間毎日練習したかいがある。
sannenkan mainichi renshuushita kaigaaru.
Every day for three years, it is worth practicing. neutral
並んだかいがあったね、このパン、めっちゃ美味しい！
naranda kai ga atta ne, kono pan, meccha oishii!
Standing in line was worth it, huh — this bread is seriously delicious! casual