Tamagotchi Ocean (Umino)
The Tamagotchi Ocean is considered the hardest tamagotchi to keep alive and features a sensor to keep away predators such as the polar bear. The Tamagotchi Ocean starts as a Planktontchi to a Kuragetchi and then teen depending on care , 2 care misses – Kingyutchi, good care – Otototchi. Adults evolve as per below:
| Character | Evolves From | Care |
| Keropyontchi | Ototchi | perfect care |
| Tayakitchi | Kingyutchi Ototchi | perfect care Slightly imperfect care |
| Ashigyotchi | Kingyutchi | completely dirty water 10 minutes before evolution |
| Kujiratchi | Kingyutchi | 99 weight 10 minutes before evolution |
| Kaitchi | Kingyutchi | Bad Care |