Dementia research has shown that there is no definite cure for this disease. It is also known that increased levels of brain activity would evade chances of getting a patient in worse conditions. This study proposes an Android-based mobile game that is designed to increase brain activities among the users especially the dementia patients, as this game involves logic, mathematics and problem-solving skills. In addition to strategizing for the gameplay and the aesthetical attribute of the gaming application called Gamentia, the underlying challenge would be how to engage senior citizens or older adults with no prior experience in using computer or mobile device.