NagareZan - Math Puzzle Game

Numbers are bouncing around the screen. Grab the right ones before time runs out!
NagareZan is a fresh take on the math puzzle — drag, drop, and solve.

■ How to Play

The bottom half of the screen is filled with bouncing number balls.
A math equation appears on the blackboard (e.g., □ + □ = 11).
Drag the correct number balls into the empty slots.

When all slots are filled, the game checks your answer automatically.
Get 5 correct answers within 60 seconds to clear the round!

■ 5 Difficulty Levels — Level Up Like You're Back in School

[Easy] Grade 1–2 level
Addition only. Great for warming up or getting kids started.

[Normal] Grade 3 level
Addition, subtraction, and multiplication. Two-operator equations appear.

[Hard] Grade 4 level
Two-operator equations become the norm. Balls move faster.

[Oni / Fierce] Grade 5 level
Fractions are here! Add, subtract, and multiply fractions with the same denominator — all in your head.

[Kami / Master] Grade 5–6 level
Mixed denominators. You need to find the LCM mentally before you can answer. The ultimate challenge.

■ Earn Coins and Keep Growing

Every round you clear earns coins.
Spend coins to unlock the next difficulty level.
Or pick up in-game items to help you through tough rounds:

- Time Extend: +10 seconds on the clock
- Ball Stop: Freeze the balls to buy thinking time
- Hint: Auto-fills the answer slot for one question
- Skip: Replace the current question with a new one

Beat your best clear time. Clear without items for a bonus coin reward.

■ Ads That Respect Your Time

No banner ads. No forced video interruptions.

- After clearing a round: optionally watch a short video to double your coin reward.
- When time runs out: optionally watch a video to continue with +30 extra seconds.

That's all. No ads during gameplay. No pop-ups. Your choice, always.

■ Who Is This For?

- Kids who want to get better at math
- Adults who want to sharpen mental arithmetic
- Anyone who wants a quick brain workout during commute or a break
- Puzzle fans looking for something beyond sudoku or number games
- Players who enjoy earning progress through skill improvement

■ Requirements

Android 7.1 or later / Offline play supported (internet required for ad videos)
Free to download and play

■ Sound Effects Credit

Sound effects in this app are sourced from:
- Soundeffect-Lab (https://soundeffect-lab.info/)
- DOVA-SYNDROME (https://dova-s.jp/) — "Coin Get" by Hifumi Theory
- Pixabay (https://pixabay.com/)

Privacy Policy: https://obaryosuke.github.io/nagarezan-privacy/
Developer: obaryosuke (Ryosuke Oba)
Contact: obaryosuke1021@gmail.com