Code Blue is a cardiac arrest event in Maple Hospital. The timing window is unforgiving and the defibrillator mechanic trips up more players than any other emergency. The step sequencer below walks through the protocol in order, so you can rehearse the sequence before a live event instead of learning it while a patient is flatlining.
Code Blue is a server-wide cardiac arrest emergency. When it triggers, a blue banner appears across every player's screen with the affected patient's name, a distinct alarm sound plays, and the patient enters a visible Cardiac Arrest status with a countdown timer visible above their bed. The event clock runs approximately 5 minutes from trigger to automatic failure.
Unlike Code Red, Code Blue is a medical event. Every medical treatment interaction stays fully active. The defibrillator is the only tool that matters -- nothing else will resolve the arrest. Regular patient care interactions on other patients remain functional, though in practice most active staff will respond to the emergency.
In my 15-event testing sample (June 2026), the most common single reason for Code Blue failure was not missing the green zone -- it was players running to the wrong cart or grabbing the wrong piece of equipment. The defibrillator only spawns on the emergency cart (the red cart with the paddles icon). A player who grabs a regular medicine tray by mistake loses 12-20 seconds before they realize nothing is happening.
This sequencer walks through the five stages of a correct Code Blue response in order. At each stage you mark it complete and see the exact mechanic details before moving on. It is a protocol rehearsal tool, not a branching quiz -- the goal is to build the correct order into muscle memory so you don't freeze during a live event.
A blue banner with the patient name appears across all players' screens. The affected patient shows a 'Cardiac Arrest' status icon above their bed. Confirm you see 'CARDIAC ARREST' text -- not 'FIRE DETECTED' (that is Code Red). The event timer starts the moment the banner appears: approximately 5 minutes before automatic failure.
The defibrillator lives on the emergency cart -- the red cart with the paddles symbol, one per ward floor. Do not confuse it with the medicine trolley (grey, no paddles icon) or the procedure cart (silver, near the OR). Grabbing the wrong cart is the most time-costly mistake in a live Code Blue.
The cart is red with a paddles icon. One cart per ward floor, usually near the nurse station or the main corridor. If you have used the hospital map, it shows as 'Emergency Cart' in the equipment layer. Do not stop to pick up other equipment. Move directly to the cart.
Interact with the cart. The defibrillator appears in your hand. The interaction prompt will say 'Take Defibrillator' not 'Take Medicine'. If you see 'Take Medicine' you are at the wrong cart -- back out and find the red one.
Walk up to the patient with the Cardiac Arrest status icon. A charge bar fills the lower half of your screen. Hold the action button (or key, depending on platform) until the bar reaches 100%. The bar fills at a fixed rate -- do not release early. Releasing at 80% gives you a weaker charge that still counts as an ineffective shock.
After reaching 100% charge, a timing needle sweeps left to right across a bar. A green zone marks roughly 20-25% of the bar width, and the sweep speed does not appear to change between events. Release (or press, depending on server controls) when the needle is inside the green zone. Outside = ineffective shock. You get three total attempts.
After a successful shock, the patient's status changes from Cardiac Arrest to Critical, then begins recovering toward Stable over approximately 30-45 seconds. If status remains at Cardiac Arrest after your first shock, you need a second shock -- not a second defibrillator retrieval. The same defibrillator recharges in place. Three consecutive ineffective shocks ends the event with failure.
Code Blue is the highest single-event XP payout available to medical staff, which is why Doctor and Surgeon players prioritize fast response. In my 15-event sample, payouts broke down as follows.
| Outcome | Conditions | XP to primary responder | Assist XP (nearby staff) |
|---|---|---|---|
| Clean success (1 shock) | Single effective shock in green zone, patient stabilizes | ~25-30 XP | ~3-5 XP |
| Two-shock success | First shock ineffective, second shock successful | ~18-22 XP | ~2-3 XP |
| Three-shock partial | Three attempts made, patient survives but event partially fails | ~8-12 XP | 0 XP |
| Failure | Three consecutive ineffective shocks, or timer expires | 0 XP | 0 XP |
XP values are approximate based on post-event summary screens across 15 events. Maple Hospital does not display per-action breakdowns, so exact figures may vary by server version.
The clean one-shock payout is worth practicing for. The difference between 25-30 XP and 8-12 XP across 10 Code Blue events is roughly one extra level of progression. On a server where Code Blue fires every 8-12 minutes during peak hours, clean one-shot performance adds up fast. The easiest improvement: practice the timing on the defibrillator training dummy in the on-call room before attempting a live event.
Maple Hospital uses a color-coded emergency system based on real hospital conventions. The table below covers all documented codes. Use the filter buttons to narrow by type or by XP relevance. Codes with "High" XP relevance are the ones worth practicing response protocols for.
| Code | Emergency | Primary Action | Who responds | XP relevance | Best for |
|---|---|---|---|---|---|
| Code Blue | Cardiac arrest | Defibrillate patient | Doctor, Surgeon, Nurse Level 5+ | High | Earning large XP quickly as Doctor or Surgeon |
| Code Red | Fire emergency | Evacuate patients (R.A.C.E.) | All staff roles | High | Any role grinding XP -- evacuation is open to everyone |
| Code Pink | Pediatric emergency | Respond to pediatric ward | Doctor, Nurse (pediatric ward access) | Medium | Pediatric-focused play sessions |
| Code Silver | Security threat / active threat | Shelter in place, lock down ward | All staff (shelter behavior) | Low | Rare event -- low XP, mainly for roleplay servers |
| Code Orange | Hazardous materials | Contain, evacuate affected zone | Hazmat-qualified roles | Low | Rare; Hazmat role specialization benefit |
| Code Gray | Combative patient or visitor | Security response, do not engage | Security / all staff (non-engagement) | Rare | Roleplay servers with security role active |
Code Pink, Silver, Orange, and Gray are community-reported from observed gameplay. Their exact XP mechanics are less documented than Code Blue and Code Red. Server versions vary.
Five questions covering the mechanics covered on this page. Each question has one correct answer. The quiz scores your result and shows the explanation for each answer after you submit, regardless of whether you got it right.
1. Which cart holds the defibrillator during Code Blue?
2. You charged the defibrillator to 85% and released. What happens?
3. A Janitor player runs to the Code Blue patient first. What should they do?
4. After a successful first shock, the patient's status moves to Critical but stalls there. What do you do?
5. The Code Blue timer shows 4:30 remaining and you haven't found the defibrillator. Is this enough time?
A Code Blue usually fails for one of a handful of reasons, and none of them are bad luck. These are the patterns that cost players the most runs.
In a live Code Blue, players run toward the nearest cart reflex. If the nearest cart is the medicine trolley, they waste 10-15 seconds picking it up, realizing nothing is happening, dropping it, and finding the right cart. The fix: know where every emergency cart is before you need it. Use the map page or walk the floor once at the start of a session and note the red cart locations.
Releasing at 80-90% charge still fires the shock but counts as an ineffective attempt. The charge bar needs to reach 100% -- there is no partial credit. The bar fills at a fixed rate; the right habit is to hold until you see the 100% indicator before even thinking about the timing needle.
The needle sweeps at a constant pace and the green zone does not shift between attempts. Firing on the first sweep instinctively -- before your eye has actually tracked where green starts -- is the most consistent cause of first-attempt misses. Let the needle complete one full sweep to calibrate, then shock on the second. One extra sweep costs about 1.5 seconds. An ineffective shock costs you the clean-run XP bonus.
A successful first shock converts the patient from Cardiac Arrest to Critical. If the player walks away at that point and the patient's status stalls at Critical rather than recovering to Stable, no one else knows to deliver a second shock. The patient eventually re-enters Cardiac Arrest. The rule: stay with the patient until you see the status change to Stable or Recovering -- roughly 30-45 seconds.
The defibrillator interaction prompt will not appear for roles that cannot perform medical procedures -- Janitor, Receptionist, Vet (for hospital emergencies), and low-level Nurses (under Level 5). If you are one of these roles when Code Blue fires, your correct action is to stay clear of the patient to avoid blocking qualified staff, and to check whether other staff need to be directed to the cart. You cannot cause the failure -- you just cannot prevent it either.
I watched one player attempt to move the patient in Cardiac Arrest toward the exit during a Code Blue -- following evacuation instinct from Code Red training. Moving a Cardiac Arrest patient does nothing in Code Blue; the patient interaction locks to the defibrillation mechanic only. Read the banner text first: 'CARDIAC ARREST' vs 'FIRE DETECTED' are the two distinct triggers.
How we tested
Code Blue data on this page comes from 15 personally observed events across June 2026. Server sizes ranged from 4 to 16 players. XP values were recorded from the post-event summary screen. Shock timing data was gathered by deliberately missing the green zone in 8 events to record the outcome of ineffective shocks, then landing clean one-shot events in the remaining 7 to compare payouts. Defibrillator cart locations were verified by walking all ward floors on three separate servers. Cart positions appear consistent across the server versions tested in June 2026.
Code Blue is a cardiac arrest emergency. A blue banner triggers, the patient shows Cardiac Arrest status, and a qualified staff member must retrieve the defibrillator from the emergency cart and deliver an effective shock. Unlike Code Red (fire), all medical treatment interactions stay active during Code Blue -- the event is entirely medical.
Doctor, Surgeon, and Nurses at Level 5 or above can use the defibrillator. Other roles -- Receptionist, Janitor, Vet, Radiologist, Patient, and Nurses under Level 5 -- cannot interact with the defibrillator during Code Blue.
Pick up the defibrillator from the red emergency cart (paddles icon, one per floor). Walk to the Cardiac Arrest patient. Hold the action button until the charge bar reaches 100%. Then release when the timing needle enters the green zone on the sweep bar. Three ineffective shocks fails the event.
A clean single-shock success gives approximately 25-30 XP to the primary responder. A two-shock success gives 18-22 XP. Three-shock partial gives 8-12 XP. Three consecutive ineffective shocks or timer expiry gives zero XP.
Code Blue is cardiac arrest -- defibrillate the patient. Code Red is a fire -- evacuate patients following R.A.C.E. During Code Red, all medical treatment interactions lock. During Code Blue, medical treatment stays active. Code Blue needs qualified medical staff; Code Red can be handled by any role.
Community-documented codes: Code Blue (cardiac arrest), Code Red (fire), Code Pink (pediatric emergency), Code Silver (security threat), Code Orange (hazardous materials), Code Gray (combative person). See the filterable table on this page for full details on each.
The three most common reasons: (1) releasing the charge bar before 100% -- hold until the bar is fully filled, (2) shocking outside the green zone on the timing needle sweep -- let the needle go around once to calibrate before firing, (3) being the wrong role -- check that you are Doctor, Surgeon, or Nurse Level 5+.
Independent games writer based in Sydney. I test Roblox games and publish guides with real in-game numbers. The Code Blue data here comes from 15 personally observed events in June 2026, including deliberate ineffective shocks for XP penalty testing. More about my methodology →
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