The text provided does not contain a grid with hidden words, so it's not possible to directly find words hidden in a grid or a secret word from the given content. However, the text describes features of a word search game. If you're looking for a list of words or themes that might be included in such a game based on the description, here are some possibilities:
- English words (as the game supports English and other languages)
- Vocabulary (as the game helps improve vocabulary)
- Concentration, thinking, memory (as the game trains the brain)
- Clues (as the game provides clues for finding hidden words)
- Secret words (as the game includes finding secret words with remaining letters)
- Difficulty levels (very easy, easy, medium, hard)
- Languages (English, Spanish, French, Portuguese, German, Italian)
- Dark mode (for eye protection)
- Autosave (to continue games later)
- Settings (colors, animations, sounds, vibrations)
- Devices (phone, tablet, Chromebook)
- Offline play (no internet required)
- Rankings (for comparing times with friends)
- Achievements (for Google Play Games account)
If you have a specific grid or puzzle in mind, please provide it so I can assist you in finding the hidden words and the secret word.