A reality check is a reminder that interrupts play at set intervals to show how long you have been playing, and often your wins and losses in that time. You can usually choose to carry on, view your history or log out.
Most GB-licensed casinos let you set the interval in your account's safer gambling settings. It is one of several tools, alongside deposit limits, loss limits, time-outs and self-exclusion.
GB-licensed online slots must also show your net position and time played on screen during play, so the information is always visible, not only at intervals. A reality check adds a pause, which is the point: it gives you a moment to decide rather than play on by default.
See our safer gambling page for the full set of tools.