The script I posted works on my Windows 10 with Strawberry 5.26.0 -- so ReadKey works on Windows 10. Which means there might be something different about your installation of Strawberry perl. Which is why I asked for the output of the long-form perl -V (that's a capital V), which gives many more details about the specifics of your installation. I am hoping it may show the subtle differences between your install and mine. Hence, I will ask again, but more explicitly this time: please include the full output of perl -V (capital V) inside <code> tags in your response.

Also, please include the output from C:\>perl -MTerm::ReadKey -lE "say $Term::ReadKey::VERSION" (which for mine is 2.37_01).

When I save the program I mentioned previously as "C:\usr\local\share\PassThru\perl\perlmonks\1212444.pl", then do Win+R (Windows > Run), and run cmd /k perl "C:\usr\local\share\PassThru\perl\perlmonks\1212444.pl", or when I run a cmd.exe window and run perl "C:\usr\local\share\PassThru\perl\perlmonks\1212444.pl", I get the results I showed. When you ran my script, how exactly did you run it? Did you have a cmd.exe window open already (or a powershell, or some other shell)? Or did you run it from Win+R? Are you going through a file association (running it as "1212444.pl", or double-clicking the file through Explorer), or do you explictly run it as "perl 1212444.pl"? I am looking for subtleties, so please don't skimp on details.

Here is the perl -V output:

Microsoft Windows [Version 10.0.16299.309]
(c) 2017 Microsoft Corporation. All rights reserved.

C:\Users\Scott>perl -V
Summary of my perl5 (revision 5 version 16 subversion 3) configuration
+:

  Platform:
    osname=MSWin32, osvers=4.0, archname=MSWin32-x86-multi-thread
    uname='Win32 strawberry-perl 5.16.3.1 #1 Tue Mar 12 13:55:20 2013 
+i386'
    config_args='undef'
    hint=recommended, useposix=true, d_sigaction=undef
    useithreads=define, usemultiplicity=define
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=und
+ef
    use64bitint=undef, use64bitall=undef, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='gcc', ccflags =' -s -O2 -DWIN32  -DPERL_TEXTMODE_SCRIPTS -DPER
+L_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -fno-strict-aliasing -mms-bitf
+ields',
    optimize='-s -O2',
    cppflags='-DWIN32'
    ccversion='', gccversion='4.6.3', gccosandvers=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=undef, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='long lo
+ng', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='g++', ldflags ='-s -L"C:\strawberry\perl\lib\CORE" -L"C:\straw
+berry\c\lib"'
    libpth=C:\strawberry\c\lib C:\strawberry\c\i686-w64-mingw32\lib
    libs=-lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool -lcomdlg32 
+-ladvapi32 -lshell32 -lole32 -loleaut32 -lnetapi32 -luuid -lws2_32 -l
+mpr -lwinmm -lversion -lodbc32 -lodbccp32 -lcomctl32
    perllibs=-lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool -lcomdl
+g32 -ladvapi32 -lshell32 -lole32 -loleaut32 -lnetapi32 -luuid -lws2_3
+2 -lmpr -lwinmm -lversion -lodbc32 -lodbccp32 -lcomctl32
    libc=, so=dll, useshrplib=true, libperl=libperl516.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_win32.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags='-mdll -s -L"C:\strawberry\perl\lib\CORE
+" -L"C:\strawberry\c\lib"'


Characteristics of this binary (from libperl):
  Compile-time options: HAS_TIMES HAVE_INTERP_INTERN MULTIPLICITY
                        PERLIO_LAYERS PERL_DONT_CREATE_GVSV
                        PERL_IMPLICIT_CONTEXT PERL_IMPLICIT_SYS
                        PERL_MALLOC_WRAP PERL_PRESERVE_IVUV PL_OP_SLAB
+_ALLOC
                        USE_ITHREADS USE_LARGE_FILES USE_LOCALE
                        USE_LOCALE_COLLATE USE_LOCALE_CTYPE
                        USE_LOCALE_NUMERIC USE_PERLIO USE_PERL_ATOF
  Built under MSWin32
  Compiled at Mar 12 2013 14:01:07
  @INC:
    C:/strawberry/perl/site/lib
    C:/strawberry/perl/vendor/lib
    C:/strawberry/perl/lib
    .

C:\Users\Scott>
[download]

Here is the output of term readkey:

2.37
[download]

I copied and pasted your program into notepad....saved it as test.pl and ran it using the strawberry perl interpreter from the run start menu and I also right clicked it and ran it with the strawberry perl command interpreter

You said you were using perl 5.26, but you showed 5.16.3; I tried on my 5.16.3 64-bit installation (your as shown is 32bit), but the Term::ReadKey worked there, too. Your Term::ReadKey version is 2.37, whereas mine is 2.37_01. Maybe Strawberry patched it (Term::ReadKey is in the "vendor/lib/Term/ReadKey.pm" of my Strawberry 5.26.0 64bit installation; when I look on cpan, Term::ReadKey lists 2.37, so that's why I assumed it was a strawberry patch), so you might want to verify that you've really got the strawberry installation you think you have (since you claimed 5.26, but showed 5.16.3).

I tried again, showing my whole sequence, trying with my default 5.26.0_64, the older 5.16.3_64, and just now also tried a 32bit version (5.26.1_32). All three worked for me. Two of the three were using Term::ReadKey version 2.37_01.

Mine:
C:\usr\local\share\PassThru\perl\perlmonks>perl -lE "use Term::ReadKey
+; say $Term::ReadKey::VERSION; say $INC{'Term/ReadKey.pm'}"
2.37_01
C:/usr/local/apps/berrybrew/perls/5.26.0_64_PDL/perl/vendor/lib/Term/R
+eadKey.pm

C:\usr\local\share\PassThru\perl\perlmonks>perl 1212444.pl
Test
Test
Exit With Key q

C:\usr\local\share\PassThru\perl\perlmonks>berrybrew use 5.16.3_64
perl-5.16.3_64
==============
Microsoft Windows [Version 10.0.16299.248]
(c) 2017 Microsoft Corporation. All rights reserved.


<berrybrew use 5.16.3_64>: run "exit" leave this environment
C:\usr\local\share\PassThru\perl\perlmonks>perl -lE "use Term::ReadKey
+; say $Term::ReadKey::VERSION; say $INC{'Term/ReadKey.pm'}"
2.30.02
C:/usr/local/apps/berrybrew/perls/5.16.3_64/perl/vendor/lib/Term/ReadK
+ey.pm


<berrybrew use 5.16.3_64>: run "exit" leave this environment
C:\usr\local\share\PassThru\perl\perlmonks>perl 1212444.pl
Test
Test
Exit With Key q


<berrybrew use 5.16.3_64>: run "exit" leave this environment
C:\usr\local\share\PassThru\perl\perlmonks>exit

Exiting <berrybrew use 5.16.3_64>
C:\usr\local\share\PassThru\perl\perlmonks>berrybrew use 5.26.1_32
perl-5.26.1_32
==============
Microsoft Windows [Version 10.0.16299.248]
(c) 2017 Microsoft Corporation. All rights reserved.


<berrybrew use 5.26.1_32>: run "exit" leave this environment
C:\usr\local\share\PassThru\perl\perlmonks>perl -lE "use Term::ReadKey
+; say $Term::ReadKey::VERSION; say $INC{'Term/ReadKey.pm'}"
2.37_01
C:/usr/local/apps/berrybrew/perls/5.26.1_32/perl/vendor/lib/Term/ReadK
+ey.pm


<berrybrew use 5.26.1_32>: run "exit" leave this environment
C:\usr\local\share\PassThru\perl\perlmonks>perl 1212444.pl
Test
Test
Exit With Key x


<berrybrew use 5.26.1_32>: run "exit" leave this environment
C:\usr\local\share\PassThru\perl\perlmonks>exit

Exiting <berrybrew use 5.26.1_32>
[download]

Right now, I'm leaning towards guessing there may have been a bug or Strawberry incompatibility in Term::ReadKey 2.37, which Strawberry patched in 2.37_01, but that you aren't using that because you're actually using an older Strawberry than you thought.