Mathematical train [ heys guys 3 slots added, faster take your games ;) ]

I'm back
After a long time break i`ve made this mathematical puzzle
Rules :
a) Reduction
Write down a fractional number (unswer) only for 2 digit after dot
example: 1) pi = 3.14159265.... write it only like 3.14
2) 34/10 = 3.4 write it only like 3.40

b) Designations
" + " plus
" - " minus
" / " division
" * " multiplication
" ! " factorial
" ^ " power
" v " sqr root ( letter " v " )
" oo " infinity (letter " o "x2 )
" int " integral

c) Lvls of difficulty:

1.Hard

• Never Alone Arctic Collection
• Asdivine Hearts
• Cognition: An Erica Reed Thriller
• G Prime
• Smell Of Death
• Else Heart.Break()

2.Medium

• Rooms: The Main Building
• The Silent Age
• Paranautical Activity
• Morphine

3.Easy

• Russian Horror Story

• Spakoyno: Back to the USSR 2.0

• Draw Rider

• Billiard: VR

• p.s.
  1) i could give u a little tips if u dont get this math quest. just leave your comment below
  2) there is 0 contributor lvl ( i need your knowlege, not a sg lvl )
  3) sry for my engl, im doing my best
  4) THE LAST MAIN RULE BE CARE : IM NOT SURE IF ALL KEYS R WORKING SO JUST BE RDY TO GET EMPTY KEY, SRY IF U WILL GET IT !!!