Table:
0
A
B
C
D
E
1
Name
Current version
System
Platform
License
2
Atari800
3.0.0
Atari 5200 , various Atari 8-bit computers
Cross-platform
GPL
3
Altirra
2.30
Atari 5200 , various Atari 8-bit computers
Windows
GPL
4
Atari++
1.72
Atari 5200 , various Atari 8-bit computers
Cross-platform
GPL
5
Rainbow
2.2
Atari 5200 , various Atari 8-bit computers
Windows, Mac OS, OS X
Freeware
6
kat5200
0.6.2
Atari 5200 , various Atari 8-bit computers
Windows
GPL

Questions and formulas:
Question: What is the System with the Current version 3.0.0?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="3.0.0"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,B2:B6="3.0.0"),3))
Level: medium
Question: What is the Name when the License is gpl and the Current Version is 1.72?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(E1="gpl")*(B1="1.72")),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,(E2:E6="gpl")*(B2:B6="1.72")),1))
Level: medium
Question: What is the System when the Licence is gpl and the Current Version is 1.72?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(E1="gpl")*(B1="1.72")),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,(E2:E6="gpl")*(B2:B6="1.72")),3))
Level: medium
Question: What is the System with a freeware License?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="freeware"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,E2:E6="freeware"),3))
Level: medium
Question: What is the License when the Platform is windows and the Name is Altirra?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1="windows")*(A1="altirra")),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,(D2:D6="windows")*(A2:A6="altirra")),5))
Level: medium
Question: What Platform has a Current Version 0.6.2?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="0.6.2"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,B2:B6="0.6.2"),4))
Level: medium