The proposed study involves conducting a larger-scale study exploring Game Plan's effects among MSM in the real-world, alongside innovative approaches for expanding HIV testing. Using a hybrid 1 effectiveness-implementation approach, the investigators will recruit up to 360 high-risk, heavy drinking MSM online from several high-incidence areas in the US to participate in a program providing home-based HIV/STI self-tests in the mail at regular intervals over a year (baseline, 6 months, 12 months). Participants will be randomly assigned to receive access to either (1) a 24-hour helpline for counseling/referrals, or (2) the helpline plus Game Plan. Investigators will test whether those who use Game Plan show lower rates of heavy drinking, any STIs, and high-risk CAS events compared to those receiving access to the helpline alone.

This is a hybrid 1 effectiveness-implementation, mixed methods study that involves conducting a longitudinal randomized controlled trial in which high-risk, heavy drinking MSM (N = 360) will be recruited online from several high-incidence US cities: Atlanta, Los Angeles, Miami, New Orleans, Washington DC/Baltimore. Participants will be sent HIV and STI self-testing kits at baseline, 6 mo., and 12 mo. Along with their test kits, they will be randomized to receive access to either: (1) a 24-hour helpline providing free standard post-test counseling and referral, or (2) the 24-hour helpline plus the Game Plan app. Test kits will provide testing and results for HIV, Syphilis, and genital, rectal, and pharyngeal Gonorrhea and Chlamydia, as well as phosphatidylethanol (PEth). Participants will also be asked to complete an online follow-up survey every three months that assess drinking, sexual behavior, and use of prevention methods over the 12-month study period. At 12 mo., 30 participants and 12 HST stakeholders will be recruited to participate in qualitative interviews to issues relevant to implementing Game Plan alongside HIV testing programs. Specifically, this study aims to: (1) test whether using a brief, MI-inspired, web-based intervention (Game Plan) after HST reduces (a) binge drinking, (b) the average number of drinks per drinking day over 12 months among heavy-drinking and high-risk, HIV-negative MSM, compared to providing access to a 24h helpline providing risk-reduction counseling alone, (2) test whether using Game Plan results in lower rates of (a) bacterial STIs, (b) high-risk CAS, and (c) higher rates of PrEP uptake over 12 months, and (3) to assess Game Plan's potential for implementation into self-testing programs by examining indicators of adoption, engagement, appropriateness and satisfaction among MSM assigned to have access to the site. Investigators will use site metrics and responses, survey data, and in-depth qualitative interview data from users and virtual focus groups with stakeholders to help address key implementation questions.

Inclusion Criteria:

• Assigned male sex at birth
• Currently male gender
• 18+ years old
• HIV-negative or unknown status
• Able to speak and read English or Spanish fluently
• Report drinking heavily within the past month, defined according to NIAAA guidelines as having drank >5 drinks on a single occasion at least once or an average of >14 drinks in a given week
• Not being currently prescribed or taking PrEP
• Having met at least one of three HIV-risk-related PrEP eligibility criteria in the last 6 months: (a) having been diagnosed with an STI, (b) currently having regular anal sex with a man who is HIV-positive, or (c) having had anal sex without a condom with a man outside of the context of a sexually exclusive relationship with a single partner who has been recently tested and is HIV-negative.

Exclusion Criteria:

• Injection drug use in the past year
• Screened positive for drug use disorder
• Report history or risk of complicated alcohol withdrawal
• Report currently receiving medications or counseling for an alcohol or drug use disorder

Participants who are (1) assigned male sex at birth, and (2) currently male gender are eligible.

Individual participant data will be uploaded to the National Institute on Alcohol Abuse and Alcoholism data archive (NIAAA-DA) every 6 months while the trial is actively recruiting and collecting data, with a final dataset planned for upload within 6 months of the final follow-ups being conducted, as per NIAAA policy. The dataset will be formatted, structured, and curated to align with NIAAA policy.

Full datasets of participants agreeing to share their data with the NIAAA-DA will be uploaded once every 6 months while the trial is ongoing, with a final dataset uploaded within 6 months of completing the final follow-ups. Data will be made available from the NIAAA-DA for registered researchers after an embargo period of 2 years after the final dataset is uploaded.

Researchers who have registered with the NIAAA-DA are eligible to access data from this trial.

All key study personnel will be blinded to participants' condition assignments. Since participants are encouraged to complete both STI self-testing and follow-up online surveys via automated emails linking to a web-based survey system, no members of the study staff will be serving as outcomes assessors. As such, outcomes assessment is also blinded to study condition.