How many eggs are given in the pre-launch event?

That is a daily allowance, not a one-off handout. The three eggs reset once per day for the length of the event, so the way to get more is to come back the next day and log in again. Skip a day and there is nothing to stack up later; the count starts again at three.

What arrives is random. You get three random Aniimo eggs to hatch, with no choice of what goes into the incubator, which means the point of showing up daily is volume rather than aiming at anything in particular. Aniimo launches with over 90 basic catchable creature forms. Three a day across a short event is a head start, not a collection.

When the event ran and where

This was the Time to Aniimo pre-launch web event, also labelled Pre-Launch Collector, and it ran from August 26 to September 3, 2026. The login had to happen on the official website rather than in the game, so it was a browser task each day. The dates are given in UTC+8, which matters if you are far enough from that clock for your idea of "today" to disagree with the event's.

Eggs you also get at launch

The pre-launch event is not the only free source. Global launch rewards include eggs as well, among them a free Perfect Egg, so missing days on the web event does not leave you with an empty incubator when the game opens. Sparkling Cubes are handed out in that same set of free global launch rewards.

Not settled: The eggs are random, and nothing pins down which Aniimo can come out of one, so there is no way to steer a daily batch toward a particular creature.