Daily habit first
Open the app, do 5 questions, watch the streak grow.
🦆 RubberDuck
The placement game for Indian engineering students
Practice coding-round MCQs in 3-minute daily sessions, build a streak, and move from habit to real placement prep one phone-first step at a time.
Free forever for students
Code MCQ only
Built for Android-first campuses
// Why it works
Rubber duck reasoning
Students explain their answer before they know if it is right.
Foundation starts now
Phase 2 adds the Python track, topic intro flow, and the first pass test.
// Pilot launch
// Sign in
Continue with Google
The updated spec now starts with Google Sign-In only. In production this opens the native Google picker via Supabase Auth, then checks whether the email is an academic domain.
// Profile setup
Finish in 20 seconds
Google already filled your name and academic email. Finish the last profile bits and land on Home.
Let’s start your streak
Arjun
0
Day Streak
0
Feathers
0
Level XP
// Game modes
Placement Engine
Coding Round Prep
10 companies · code MCQ only · no aptitude/verbal noise
⚡
What we do · what we don't
We prep the coding round of every company exam — predict output, spot
the bug, missing line, choose implementation, time complexity.
We don't do aptitude, verbal, or reasoning. Use IndiaBix or
PrepInsta for those.
// Tier 1 · Service-based · Programming fundamentals
// Tier 2 · Product-based · DSA-heavy
// Company-agnostic grind
🔒 Your Fit % is private. Only you see it. Never appears on Top Ducks or shared
profiles.
Coding MCQ
30:00
// MOCKING
🎯
Coding round only
Concept MCQ
Question prompt
🎯
// Mock result
TCS NQT
Would you have cleared the coding round today?
// Topic breakdown
// Format breakdown
// Recommended practice
// Mistake review
Coding round only
// Daily Top Ducks
Campus leaderboard
Feathers drive the board. Fit % never appears here. The focus is visible daily status, not private company readiness.
Today · resets at IST midnight
Hyper-local, feather-based, and private Fit % stays off the board.
// Foundation
Pick your language
// Track map
Foundation · Python
// Chapter 1
The Absolute Basics
Start with Variables and Memory Allocation, then move through the rest of Python one stage at a time.
Imported bank
This build now loads all chapters from the updated source files so Foundation, Daily Bug, and shared Prep can reuse the same verified question bank.
// Chapter 1
Variables and Memory Allocation
// Before the test
Variables and Memory Allocation
Learn how names bind to objects, what reassignment really changes, and why that matters for debugging.
// The idea
// Worked example
Rebinding a name
// Important rules
// Common mistakes
// Why it matters for placements
// Select difficulty
10 questions · 6 MCQs + 2 Bug-Fix + 2 Missing-Line
Same pool, different pass threshold by difficulty
◆ 0 / 7 to pass
MCQ
Concept MCQ
What is a variable in Python?
Clean.
Correct answer locked.
Missed
Let’s break it down 🦆
You didn’t write your reasoning this time. Try rubber ducking before you lock in.
This option doesn’t match the rule being tested.
The correct answer follows the rule being tested in this topic.
⚡
// Topic complete
Clear!
Variables and Memory Allocation is now cleared at Easy.
// Reward breakdown
// Mistake Lab
Review what tripped you
// Ranked by impact
💡 The Mistake Lab keeps your wrong answers searchable forever. Use Retry to
attempt again with fresh Pre-Answer Reasoning.
🔥 0
0:42
// FROM
🐍
Python · Lists
Spot The Bug
This function should return the sum of all numbers. Tap the broken line.
Clean.
Line 4 uses `=` instead of `+=`
Missed
Let’s break it down 🦆
You didn’t write your reasoning this time. Try rubber ducking before you lock in.
This line actually works as intended.
This line overwrites the accumulator instead of adding to it.
🔥
// Daily Sprint complete
Your streak is live
Day one is working: you completed the 5-question loop and unlocked the core habit.
// Sprint recap
// What this proves
The day-one loop works locally: sign in with Google, pass the academic-domain check, land on Home, run a 5-question Sprint, and celebrate the streak.