Objective: The primary objective is the evaluation of the potential positive effect of the combined computerized and face-to-face memory treatment on effective memory strategy use and reducing subjective memory failures in ABI patients with memory deficits in the chronic phase of acquired brain injury (\>3 months after injury). Study design: The study will be a multiple-baseline across individuals single-case experimental design (SCED). Three patients will receive treatment as usual and three patients will receive a shortened treatment combined with the game, which will be referred to as the 'Karman Line memory strategy training'. Study population: The study population consists of patients referred for outpatient cognitive rehabilitation. Participants eligible for the study must have memory deficits and complaints due to Acquired Brain Injury (ABI) of nonprogressive nature (i.e. TBI, stroke), with a minimum time post-onset of 3 months. Age has to be between 18 and 75 and participants have to live independently at home. Memory deficits will be assessed by neuropsychological examination, memory complaints will be assessed by the Everyday Memory Questionnaire-Revised (EMQ-R). In one year six to eight participants will be recruited. Intervention: The Karman Line memory strategy training consists of six weekly treatment sessions under the guidance of a therapist. The protocol is a shortened version of an existing memory strategy training (treatment as usual), which contains ten sessions. In the sessions, patients get information about memory and memory strategies and learn to apply those to their personal treatment goals. Inbetween the sessions, the participant will work on personal memory goals and practice the strategies by playing the corresponding levels of the memory game at home. Main study parameters/endpoints: The main study parameter is the three most commonly reported memory complaints selected from the 13-item scale of the EMQ-R. The primary outcome measure is not the EMQ-R, but a personalized set of measurement VAS-scales for each patient. Secondary study parameters include the impact of memory problems on activities and participation, the achievement of personalized treatment goals, objective strategy use, objective memory functioning, metacognitions about memory and measures of feasibility by patients and practitioners. Nature and extent of the burden and risks associated with participation, benefit and group relatedness: The burden in the study consists of participating in repeated measurements, therapy sessions, and homework assignments. All tests and methods that are used are non-invasive and not stressful for the patient. All tests and tasks will be based on widely-used validated and reliable paper-pencil or computer tasks. Treatment is non-invasive and scarcely stressful: a therapist will always be present and assess the patient's burden and eventually take appropriate measures such as inserting a resting break.