Talk:Monster Musume: Everyday Life with Monster Girls Online/@comment-25601391-20160519183140/@comment-27615277-20160519185628

Each of the normal maps (the ones on the first tab, not the daily maps, not the event maps) reward one ruby the first time you complete it. You also get a bunch from the one-time rewards, especially when you do a thing 700 times and 1000 times. (x number of outings, x number of grocery trips, x number of times 'caring' for your girls, etc.)  there are the login bonuses that reward rubies so long as you log in as many days as you can, and then the events reward rubies for running the event maps X number of times, and every 10 or so days, there is a new event.

TLDR: If you play through all the normal maps at least once, run the events, and log in every day, they trickle in.