There are three: Grow version 3, Grow Island, and Grow Valley. They have Fire, UFO, and Underground secret endings, respectively.
There is an easter egg in Grow Nano 2, if you do the items out of order, right to left (cape, twig, ribbon), a link to Grow Vanilla appears along with a password (6438) that lets you play a special version of that game.
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There is no secret ending. (the 3 games that do are Grow version 3, Grow Island, and Grow Valley)
Swap the order of the water and tower for the panda ending.
There is no secret ending to Grow Cube. To get all levels max, pick in this order: Man Water Plants Bucket Pipe Fire Dish Bone Ball Spring
Oh, dude, getting the secret ending on Grow Tower is like finding a needle in a haystack. You gotta place the items in a specific order to unlock it, but hey, who has time for that, am I right? Just keep randomly stacking stuff and hope for the best. Good luck, champ!
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