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Case Study: Letter Bounce. UI Design for a Mobile Game

Graphic and UI design case study devoted to the crossword mobile game Letter Bounce: check the bright clear interface, animations, mascot, and illustrated map.

Playing games is not always pure entertainment. Today we have prepared a new case on design for a mobile game. What makes it different from the Real Racer game we showed before is the balance it had to find between fun and education. So, let’s review the creative path for Letter Bounce, a bright and simple crossword game.

mobile game ui design tubik


UI and graphic design for a mobile game based on crossword puzzles.


The task our team got was creating a bright and funny interface of a crossword game for mobiles. It had to set the harmony of an educational game which is simple, funny but letting the user’s brain get some load.

The functionality of the game lied in solving the crossword-style puzzles using pairs of letters to fill in the blanks – so, it’s a modernized version of a traditional approach to crosswords. Each level had sets of letter pairs that needed to be dragged into the blank spaces to complete the words and this way player solved the puzzle. Each level had a clue to help users work out the words. The app also had an element of socializing which supported general gamification: a player could connect to Facebook and share the scores on the leaderboard as well as compete with friends. Beautiful design and animation were considered among the core features supporting user retention.

First, let’s check the main screen of the game. Below you can see the solution for interactions with the letters in the process of filling in the game grid. The top part of the screen showed key indicators: the multi-score coefficient, the level of achievements marking milestones with stars, and the number of coins that a user had at the moment. The screen background used a nice gradient that was not over brightened and didn’t distract the user. The grid was placed in the upper part of the screen and applied white background under the letters while the interactive pairs of letters were placed in the lower part and colored yellow. This way users could scan the screen and understand the difference of the layout elements due to color contrast. In the bottom part of the screen, there was a hamburger button hiding the menu, the theme of the current game, and the hint button marked with a lamp bulb icon. All the elements in the layout are designed with smooth lines and rounded corners to make the interface look playful rather than strict.

home screen crossword mobile game

Another screen presents a tutorial showing users animated interaction to make the navigation clear. For this aim, the funny letter character was used as a mascot which communicated with a user and gave the needed hint. To avoid unnecessary taps and transitions, the tips appeared on the faded screen and showed the animation imitating interaction gestures together with a text prompt.

mobile game UI animation tubik

In the flow of the UI design process, the designer offered a variety of gradients to choose from. Bright and juicy colors played a big role in creating a playful atmosphere.

Gradients game design case study


One more thing to mention was the animation of a hint button. It imitated the pulsation with lights and shadows playing on the surface to draw user’s attention to the updates. The number of coins near the hint icon shows how many coins are paid for one hint.

mobile ui design crossword-game-tubik

Various pop-up windows were created to inform users about achievements and updates, give access to settings, and present some offers from the game. Below you can see the examples: the first screen shows the pop-up with information about a completed level, total score, bonuses, leaderboard, sharing to Facebook, and options on continuing the game. The latter is presented with the round buttons in the same style as buttons on the game screen this way supporting the visual consistency. The next screen provides information on the ways to get coins. And the third app screen shows the settings.

popups design mobile ui game

One more important element of a mobile game UI is a map of levels. In Letter Bounce it was performed as a long path through a variety of beautiful landscapes from the snowy mountains to the hot volcano. Graphic designer Denys Boldyriev created unique flat illustrations for the map, vivid, lively, and full of color.

mobile game levels UI design

levels mobile design for a game

Here’s the animated flow of the illustration on the game map.


One more point to care about was an app mascot. We got a great reference for what the client wanted to see: the image had to present a recognizable letter key from the keyboard. To make it look active, it was given the visual elements of a live creature – legs and arms. They could be used for imitating universal gestures with well-known meanings like “Hi!” or “Success!” So, the mascot became another playful element of the interface with an obvious emotional appeal to add a positive mood to interactions.

app icon graphic design branding

Here you may check the app video featuring the interactions and design solutions.



The game is live on both AppStore and PlayMarket, so if you want to add a bit of fun, brightness, and brain-tickling to your day, that’s a good reason to try it.

mobile ui design for game tubik blog


Useful Case Studies

If you are interested to see more practical case studies with creative flows for mobile UI design, here is the set of them from Tubik.

Real Racing. UX and UI Design for Mobile Game

Real Racing. Graphic Design for Mobile Game

Manuva. UI/UX Design for Gym Fitness App

Cuteen. UI/UX Design for Mobile Photo Editor

Tasty Burger.UI Design for Food Ordering App

Watering Tracker. UI Design for Home Needs

UI Experiments: Options for Recipe Cards in a Food App

Night in Berlin. UI for Event App

Upper App. UI Design for To-Do List

Toonie Alarm. Mobile App UI Design

Welcome to check designs by Tubik on Dribbble and Behance; explore the gallery of 2D and 3D art by Tubik Arts on Dribbble

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