VBGhost: A Braille-Based Educational Smartphone Game for Children
Lauren R. Milne, Cynthia L. Bennett, Richard E. Ladner · 2013 · Proceedings of the 15th International ACM SIGACCESS Conference on Computers and Accessibility (Assets '13) · doi:10.1145/2513383.2513396
Summary
This short paper presents VBGhost, an accessible educational smartphone game for blind and low vision children that reinforces Braille literacy through gameplay. The game is based on Ghost, a word-building game where players take turns adding letters to a growing word fragment while trying not to complete a valid word. VBGhost was developed for Android and uses the VBraille touchscreen interface, which divides the screen into six regions representing the six dots of a Braille cell. Players enter letters by tapping dots to raise or lower them — raised dots appear filled (white) and vibrate when touched through haptic feedback, while lowered dots remain as outlines. The game was designed in consultation with students and educators from the Washington State School for the Blind, who provided feedback on a prototype of the Braille reading and writing interface. Three design principles guided development: accessible (operable autonomously by blind or low vision children, with multiple input methods including touchscreen gestures and keyboard, plus high contrast menus), educational (reinforcing Braille dot patterns through repeated practice in a fun context), and social (supporting two-player mode so blind and sighted children can play together, and sighted family members can learn Braille concepts).
Key findings
The game successfully combines Braille education with an engaging word game format. The VBraille interface provides multimodal feedback: audio announces each dot number when touched, haptic vibration distinguishes raised from lowered dots, and visual display shows the dot pattern for sighted players or those with low vision. Menu navigation uses high-contrast white text on black backgrounds, with options read aloud and selected via double tap or button press. The game supports single-player mode (against the computer, which selects letters by randomly choosing from all valid word continuations) and two-player mode where players can challenge each other's word fragments against a built-in dictionary. The paper situates the work within a concerning context: a 2009 NFB report found that only 10% of blind children in the US were learning Braille, yet Braille literacy correlates with higher education levels, income, and employment. While VBGhost cannot teach the tactile perception needed for reading physical Braille, it provides a fun way to practice and memorize dot patterns outside of school. The game and source code were made freely available.
Relevance
VBGhost addresses two intersecting accessibility challenges: the lack of accessible games for blind children and the decline in Braille literacy. Most mobile games are inherently visual and inaccessible to screen reader users, excluding blind children from an important part of youth culture and informal learning. The game demonstrates that touchscreen devices — often perceived as barriers for blind users due to their flat, featureless surfaces — can be made accessible through thoughtful use of audio and haptic feedback. The VBraille interface concept of mapping Braille cells to touchscreen regions has influenced subsequent work on mobile Braille input. The social design principle is particularly important: by enabling blind and sighted children to play together, the game promotes inclusion and mutual understanding rather than creating a segregated experience. For educators and developers, the project shows that educational accessibility tools are most effective when disguised as fun — children will voluntarily practice Braille patterns through gameplay in ways they might resist in formal instruction.
Tags: braille · mobile accessibility · game accessibility · blind children · education · haptic feedback · touchscreen · braille literacy · Android · inclusive design