versteckt
hidden
Placed or concealed in such a way that it cannot be easily seen or found.
Der Eingang zur Höhle war hinter einem Wasserfall versteckt.
The entrance to the cave was hidden behind a waterfall.

hidden
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hidden
Placed or concealed in such a way that it cannot be easily seen or found.
Der Eingang zur Höhle war hinter einem Wasserfall versteckt.
The entrance to the cave was hidden behind a waterfall.

'Versteckt' (hidden) is the past participle of the verb 'verstecken' (to hide). The prefix 'ver-' here reinforces the idea of making something impossible to find or concealing it.
Die Kinder haben sich im Garten versteckt.
The children hid in the garden.
The context shows the meaning: If 'versteckt' (hidden) refers to a place or object, it is meant literally. If it refers to communication or abstract things, it means 'not open' or 'implicit'.
Wir fanden ein kleines, verstecktes Café in einer Seitengasse.
We found a small, hidden café in a side street.
In the literal meaning, 'versteckt' (hidden) is often combined with places or things: 'ein versteckter Winkel' (a hidden corner), 'ein versteckter Schatz' (a hidden treasure), 'eine versteckte Bucht' (a hidden bay).
Hinter dem Haus gibt es einen kleinen, versteckten Garten.
Behind the house there is a small, hidden garden.
In the figurative meaning, 'versteckt' (hidden) is often found with abstract nouns: 'versteckte Kosten' (hidden costs), 'eine versteckte Botschaft' (a hidden message), 'versteckte Kritik' (hidden criticism).
Lies den Vertrag genau, oft gibt es versteckte Kosten.
Read the contract carefully; there are often hidden costs.
open
'offen' and 'versteckt' form a contrast when it comes to how clearly something is shown or said. 'Offen' means that you say something directly and hide nothing. 'Versteckt' means that something is not stated clearly or is only shown indirectly. 'Offene Kritik' (open criticism) can be heard clearly; 'versteckte Kritik' (hidden criticism) often has to be understood by reading between the lines.

In seiner Nachricht lag eine versteckte Kritik an der Planung.
His message contained a hidden criticism of the planning.
Im Gespräch war Anna offen und sagte ehrlich, was sie störte.
In the conversation, Anna was open and honestly said what was bothering her.