Help a Stranger
Guide someone who is stranded or facing a difficult situation. Ask useful questions, think through the options, and help them move toward safety.
AI-powered interactive fiction
One message.
Infinite possibilities.
A stranger reaches out. Their next move depends on you. Sender: Unknown Signal is a text-driven narrative game where you read between the lines, choose your approach, and discover how a conversation can change the course of a story.
Your words matter. Every choice is part of the story.
★ ★ ★ Earn a story rating
Unknown SignalNew message · Story in progress
Incoming transmission
I don't have much time. I found something I wasn't supposed to see. What should I do?
First, take a breath. What do you know for sure?
I have a few messages and a name. I'm not sure who I can trust.
AI-driven conversations Stories react to your approach
READ THE SIGNALMAKE YOUR CHOICESEE WHAT FOLLOWS
AI-driven storiesCharacters respond to your tone, strategy, and decisions.
Multiple approachesBe thoughtful, negotiate, challenge a claim, or take a bold risk.
Three difficulty levelsChoose Easy, Medium, or Hard to suit your preferred challenge.
Build your reputationEarn story stars, gold, achievements, and leaderboard progress.
Different stories. Different stakes.
What will you do when
the next message arrives?
Sender brings together mystery, tense decisions, and character-driven scenarios. Each conversation asks you to work with the information you have, decide what to ask next, and choose how to respond. The situations vary, so there is no single approach that fits every story.
Find the Secret
Follow clues, investigate hidden identities, question suspicious details, and try to piece together what is really happening.
Be the Villain
Take the antagonist's side in a story and explore how your tactics and decisions influence the people around you.
A Whistleblower on the Run
Help a pharmaceutical-company insider navigate a risky situation after uncovering information that could expose wrongdoing.
A Startup That Doesn't Add Up
Work with a technology startup employee who suspects a scam. Examine the clues and decide what they should do next.
A Surprise Gift Mystery
Follow an unexpected trail of messages and twists to work out what is behind a mysterious present.
These are fictional, interactive game scenarios. The available story selection may evolve as the game is updated, and additional stories may unlock as you progress.
How to play
Think. Reply.
Change the direction.
Sender is built around conversations rather than reflexes. Pay attention to what characters say, decide which details matter, and choose a response that fits your strategy. Then see how the story reacts.
Read the signal
Meet a character through a message conversation. Pick up on their situation, the clues they share, and the questions that remain unanswered.
Choose your approach
Respond with empathy, negotiate, challenge inconsistencies, bluff, or try another strategy. The best response depends on the context.
See what your words change
AI-driven character replies make conversations responsive to your choices. Finish a story, review your performance, and take on another challenge.
More than a conversation
Build a reputation
one decision at a time.
Stories are the heart of Sender, but your progress gives you more to work toward between conversations. Try different strategies, earn rewards, and make the game feel like your own.
AI-powered character responses
Characters respond dynamically to the tone and strategy you bring to a conversation, creating room to experiment with different approaches.
Easy, Medium, and Hard
Choose from multiple difficulty settings to find the level of challenge that works for you.
Story ratings
Stories award between one and three stars based on your decisions, giving you a way to reflect on how you handled each scenario.
Gold and achievements
Earn in-game gold, unlock achievements and milestones, and work toward more rewards as you play.
Global leaderboard
Compare your progress with other players and see how your performance stacks up on the global leaderboard.
Customize your avatar
Personalize your look with a broad selection of hairstyles, outfits, accessories, and backgrounds. Use gold to unlock additional premium looks.
🧑🏻💻THE ANALYST
🕵️THE SLEUTH
🧑🏽🚀THE RISK-TAKER
Make it yours
Your style.
Your strategy.
Sender lets you customize your avatar with a wide range of visual options, including hairstyles, clothing, accessories, and backgrounds. Build a look that feels like you, then unlock additional customization options with in-game gold.
Whether you enjoy carefully piecing together clues or trying an unexpected response just to see what happens, the game gives you room to develop your own way of playing.
Ready to start your first story?Good to know
Questions before
you answer?
Here are a few details to help you decide whether Sender is your kind of game.
For current compatibility, pricing, age guidance, and purchase details, check the store listing for your device and region.
What kind of game is Sender?
Sender is an AI-powered text adventure and interactive narrative puzzle game. You communicate with characters through messages, make decisions, and see how the story responds.
Do my choices affect the story?
Yes. Conversations are designed to react dynamically to your tone, tactics, and decisions. There is not always one correct answer, and trying a different approach can change how a conversation develops.
What stories can I play?
Scenarios include helping a stranger, uncovering a secret, playing an antagonist, a pharmaceutical whistleblower on the run, a suspicious technology startup, and a surprise-gift mystery. More stories may unlock as you progress.
Can I change the difficulty?
The game offers Easy, Medium, and Hard difficulty levels.
Is there character customization and progression?
Yes. You can customize your avatar, earn gold, unlock achievements and milestones, receive star ratings for stories, and compete on a global leaderboard.
Is Sender free?
Sender is free to download and includes advertising and optional in-app purchases. The availability and prices of purchases may differ by platform and region. Check your store listing for current details.
Which devices are supported, and what language is available?
The game is available on Android and on iPhone and iPad. The App Store listing specifies iOS 13.0 or later and lists English as the app language. Check the relevant store listing for the latest compatibility information.
Where can I get help or report a problem?
Email casadozeps@gmail.com and include your device type, the app version if known, and a description of the issue. Please do not include passwords or sensitive personal information.
Your next message is waiting
Ready to pick up
the signal?
Step into a story, choose your words carefully, and find out where the conversation takes you. Download Sender: Unknown Signal for your device.
Free to download. Contains advertising and optional in-app purchases. Store availability and terms may vary by region.