das Level
level
A stage or section in a computer game that a player must reach and complete.
Ich habe das letzte Level in diesem Spiel einfach nicht geschafft.
I just couldn't beat the last level in this game.

level
Loading your saved state.
level
A stage or section in a computer game that a player must reach and complete.
Ich habe das letzte Level in diesem Spiel einfach nicht geschafft.
I just couldn't beat the last level in this game.

'Level' is a word from English that has been adopted into German. It is pronounced as in English and is especially common in colloquial language and in the context of technology and games.
Das neue Update bringt viele neue Level ins Spiel.
The new update brings many new levels into the game.
In all meanings, 'Level' is almost always used with the preposition 'auf' and the dative. You are 'auf einem Level' (at a level), play 'auf einem Level' (on a level), or are located 'auf Level 3' (on Level 3).
Die Diskussion war auf einem sehr professionellen Level.
The discussion was at a very professional level.
You can recognize the meaning 'game section' from the context. Words like 'spielen' (to play), 'schaffen' (to manage/beat), 'schwer' (difficult), 'leicht' (easy), or 'Boss' (boss) clearly point to a computer game.
Dieses Level ist so schwer, ich schaffe den Endgegner nicht.
This level is so difficult; I can't beat the final boss.
The meaning 'floor' is mainly used in modern buildings such as airports, shopping centers, or large office complexes. It then usually appears together with a number.
Die Konferenz findet auf Level 5 statt.
The conference takes place on Level 5.
degree
'der Grad' and 'das Level' can both describe how strong, high, or difficult something is. 'Grad' sounds more neutral and is often used when describing an extent or intensity more precisely, for example 'der Grad der Gefahr' (the degree of danger) or 'der Grad der Müdigkeit' (the degree of tiredness). 'Level' more often means a level, especially with skills, quality, difficulty, or in modern everyday language. 'Level' sounds a bit more casual and is also often used for games or courses. If something should sound very factual or precise, 'Grad' often fits better.

Simon möchte sein Englisch auf ein höheres Level bringen.
Simon wants to bring his English to a higher level.
Der Grad der Erschöpfung war nach der langen Reise sehr hoch.
The degree of exhaustion after the long trip was very high.