Have you played through Penny Black and want to see the other endings? Or maybe just curious about some of the 'secret' choice inputs you can make? Here's a complete guide to the best of my knowledge with a few spoiler warnings and hints:

Some choices including the 'secret' ones sometimes have multiple ways to input them. For example instead of typing "PHONE" you can type "CALL" or "TEXT." I won't be listing every single iteration for those choices.

Some of the 'secret' choices are described previously in some manner, so pay attention to the story. Others aren't and you have to think of a logical solution the game accepts. Other times the choice is alluded to and hinted at, kinda like a riddle, but the answer is never directly written in the story.

Format for choice/score guide: INPUT → additional INPUTS (if any) | Score Awarded

PHONE | +10
WAIT | +5
LEAVE → WAIT | +5 hint: Are you just gonna stand there all day or are you going to...
LEAVE → LEAVE | End hint: Are you just gonna stand there all day or are you going to...

HORROR | +10
ACTION | +7
ROMANCE | +4
ASK → retry choice between the three options | 0

MAGICIAN → ANYTHING (quite literally except for the below choice, you can also just press enter) | +8
MAGICIAN → TIGER | +9 hint: If you've played the above choice this is the outcome in the story.
FLOWERS | +4
STATUE → ROCK (or SCISSORS then ROCK) | +10 hint: Something looked like it was new... also are you good at rock paper scissors?
STATUE → PAPER (or SCISSORS then PAPER) | +8 hint: Something looked like it was new... also are you bad at rock paper scissors?
FOUNTAIN | +7 hint: Somewhere with water.
PIGEONS | +7 hint: What was that boy feeding?
BUSKER | +7 hint: Can you hear the music?

AID | +10
ASK | +6
IGNORE | -5

TRUTH → a color like YELLOW or RED | +7
LIE | +5
TRUTH → BLUE | +10 hint: If Black is too obvious maybe instead...
*TRUTH → WHITE | -1 hint: The opposite of Penny.

REPRIMAND | +5
PUSH | -10
APOLOGISE | +10 hint: Did you cause this? Maybe you should...
PUNCH | End hint: Violence is never the... wait what are you doing!?

Choice 1

COIN | +5
LEAVE | +1

Choice 2

COMPETITIVELY | +5
CASUALLY | +2
CRAZILY | -5

Choice 3

WENDY | +7
SCORCHETTE | +7
**NEAPOLITAN | +10 hint: Think back to how the character has been described during the clothes shopping (3 colors of clothing) and on the side of the arcade machine (type of abilities.) hint 2: Combine that with the 3 flavors of cake that Penny had at the movie theatre. hint 3: Vanilla, Chocolate, and Strawberry in an icy dessert

BOTH | +7
PENNY | +6
LEAVE | +2
CHERRY | +10 hint: Fantasy has been mentioned before.

QUIET | +10
TALK | +6

You can get in the negative score range during the date, but it will still continue. There are also 2 endings that can happen during the date. These are listed under the score parts of the respective choices.

Ending Score Effect on Story Endings
<60 is C ending
≥60 is B ending
≥85 is A ending
100 is S ending

S ending choice:
No difference between PLEIONE, WENDY, SCORCHETTE, or NEAPOLITAN

*Thanks to earthdyedred for finding this one.
**Thanks to Wolfgang for figuring this one out.