There is no secret ending.
The level max ending is :
1. People
2. Water
3. Plants
4. Bucket
5. Pipe
6. Fire
7. Dish
8. Bone
9. Ball
10. Spring
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This could refer to the game "Grow Cube" (see related question).
Grow Cube Regular Ending 1. People 2. Water 3. Plants 4. Pot 5. Pipe 6. Fire 7. Dish 8. Bone 9. Ball 10. Spring There Is No Secret Ending
There is only one, updated version of Grow Cube. (see the related questions below)
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
There is no secret ending. (the 3 games that do are Grow version 3, Grow Island, and Grow Valley)