Preparation
01 · Define the purpose of the activity
- Determine whether it will serve as an icebreaker for introductions, a group energizer, random work team formation, or math practice.
- Adapt the narrative and complexity to the age and context of the group.
- Decide what happens to those who do not manage to form a complete group (continue playing, step out temporarily, special role).
02 · Prepare the space
- A wide area free of obstacles where everyone can move freely and form small circles.
- Mark the play zone if necessary (especially with children).
- Ensure a safe surface with no risk of tripping or falling.
03 · Prepare the sequence of numbers
- Create a mental or written list of numbers suited to the group size.
- Include variety: small numbers (2–3), medium (4–6), and occasionally larger ones.
- Calculate numbers that will always leave some participants out to maintain energy.
04 · For virtual mode (adapted)
- Use randomly assigned small breakout rooms.
- Variation: participants type in the chat, and the facilitator verifies the speed of "virtual group" formation.
Step-by-step instructions
1
Narrative introduction
- Set the scene: "We are all on a large ship sailing across the ocean."
- Explain the crisis: "Suddenly, the captain announces that the ship is sinking and we must board the lifeboats."
- Clarify the rule: "When I shout 'The ship is sinking and we save ourselves in groups of ___!', you must quickly form groups of exactly that number of people."
- Explain what happens to those who do not complete a group (depending on the version chosen).
2
Quick demonstration
- Do a practice round with a small number (e.g., 3).
- Show how to hug or hold hands to signal that a group has formed.
- Make sure everyone understands before the official start.
3
Start of the game
- Everyone walks around the space while you say: "The ship is sailing peacefully across the sea..."
- You can add narration: "The weather is good, the waves are calm..."
- Then suddenly shout: "The ship is sinking and we save ourselves in groups of ___!"
4
Rapid group formation
- Participants run to form groups of exactly the announced number.
- Groups hug, hold hands, or form a closed circle to signal they are complete.
- Count to 10 (or less for a greater challenge) to give them time to group up.
5
Verification and continuation
- Quickly verify that groups have the correct number.
- Elimination version: those who did not complete a group step out (or step back).
- Inclusive version: everyone continues regardless of whether they formed a group.
- Groups dissolve and everyone starts walking around again.
6
Successive rounds with variation
- Repeat the cycle with different numbers: "Groups of 5... groups of 2... groups of 4..."
- Progressively increase the pace.
- Introduce surprises: "groups of 7", "groups of 1 (everyone alone)", etc.
7
Finale and transition
- After 5–7 rounds, announce: "Land ahoy! Everyone is safe!"
- Option: the last number called can be the size of work teams for the next activity.
- Brief moment to catch breath and reflect if appropriate.
Materials
Wide open space free of obstacles
No specific materials needed
Optional: background ocean music to set the atmosphere
Optional: a whistle to give clear signals in very large groups
Digital tools
Practical recommendations
Start with easy, reasonable numbers (3, 4, 5) before using more challenging ones.
Observe the social dynamics: some groups tend to always form with the same people; you can intervene by asking them to mix.
To avoid systematic exclusion, use the no-elimination version or assign special roles to those left out (e.g., "sharks" who observe).
With young children, slow down the pace and celebrate each successful group formation.
With teenagers and adults, increase the pace and reduce formation time to heighten the challenge.
Use this activity strategically to form random work teams: the last number you announce defines the groups for the next activity.
Foster active inclusion: "Make sure no one is left alone; look for anyone who needs to complete a group."
In very large groups (50+), consider having assistants help verify numbers.
Keep energy high with an enthusiastic voice and dramatic sinking narration.
Inspiration
Thematic narrative variations:
- Space version: "The spaceship has a malfunction — everyone to the escape pods in groups of...". Participants move like astronauts floating in zero gravity while the facilitator narrates: "An oxygen leak has been detected; activate the emergency protocol." The formed groups can simulate entering space capsules and count down to launch. Can be set to electronic music or space sounds. Ideal for educational contexts related to science, technology, or space exploration, creating an immersive experience that connects play with learning about outer space.
- Safari version: "A lion pride is approaching — hide in the tents in groups of...". Participants walk crouched, observing the "African savanna," until the guide shouts the warning. Once in groups, they can roar like lions or imitate other wild animals. Can be integrated with content on wildlife, ecosystems, or conservation. Facilitators can use safari hats or binoculars as props. Useful for environmental education programs or themed camps where the goal is to connect with nature in a playful way.
- Winter version: "A snowstorm is starting — let's take shelter in the cabins in groups of...". Participants walk shivering, simulating being in the middle of a blizzard. The facilitator can blow imitating the wind and make sound effects. Once groups are formed, they hug tightly to "warm each other up" before entering the imaginary cabin. Can be accompanied by winter music or wind sounds. Perfect for winter season or to work on concepts of solidarity, mutual support, and collective care in adverse conditions.
- Zombie version: "The zombies are coming — protect yourselves in groups of...". Participants walk stealthily until the facilitator announces the zombie invasion. The formed groups must create a "protective circle" and can make defensive gestures or alert shouts. Those left out temporarily become zombies (walking with arms stretched out) until the next round. Generates lots of laughter and energy, especially popular with preteens and teenagers. Useful for Halloween-themed events or contexts where a high dose of fun and group adrenaline is sought.
- Historical version: "The castle is under attack — to the defensive towers in groups of...". Participants walk like medieval knights and ladies until the "castle alarms" sound. The facilitator can use a drum or bell for dramatic effect. Groups represent different castle towers and can strike a medieval guard pose once formed. Can be integrated with historical content about the Middle Ages, castle architecture, or defense strategies. Ideal for museums, history workshops, or historical reenactment events seeking experiential learning of the past.
- Aquatic version (ideal for children in a pool or at the beach): This variant transforms the activity into a refreshing and fun water game. Participants swim or move through the water while the facilitator announces: "The ship is sinking — everyone to the floating islands in groups of ___!" Children must group together by holding onto pool floats, kickboards, or simply forming circles in the water. Pool rings can be used as "lifeboats" where exactly the indicated number of participants must enter. Additional variation: use pool noodles or floating boards that each group must share to "stay afloat." This version combines physical exercise, coordination in the water, fun, and teamwork learning in a recreational aquatic context. Important: always with adult supervision, in safe water conditions, and considering the swimming levels of all participants.
- With specific characteristics: "Groups of 4 where at least one person wears glasses" or "groups of 3 with people of different ages."
- With math operations: "Groups whose ages add up to 100" or "groups of people whose birthday months are consecutive."
- With group actions: Once a group is formed, they must perform an action together (a group greeting, a shape, a sound).
- Progressive elimination: In each round, the last group to form is eliminated (if the goal is to reach a small final group).
- With rotating roles: In each round, someone from the previous group must be the "leader" of the new group.
- Mathematics: "Groups of 6" but they must subdivide into pairs and each pair must solve an operation before being considered "saved."
- Language: Once the group is formed, create a sentence where each person contributes one word, in the order they grouped up.
- History: Groups must represent a historical event with their bodies once formed.
- Science: "Groups of 4 representing the states of matter" (each person is solid, liquid, gas, plasma).
- Geography: Once in a group, they must arrange themselves geographically according to place of birth or residence.
- If you need to form work teams of 5 people, the last number you announce is 5, and those groups remain as teams for the next activity.
- To mix the group well before forming permanent teams, do several rounds with different numbers before the final formation.
- To learn names: in each formed group, participants have 10 seconds to say their names before dispersing again.
- For reflection on inclusion: at the end, ask how those who were left out felt, how they decided whom to include in their group, and what strategies they used.
- Preschool (3–5 years): Very small numbers (2, 3); slow pace; no elimination; adult facilitators actively help form groups.
- Primary (6–11 years): Varied numbers (2–6); moderate pace; gentle elimination possible; emphasis on actively including everyone.
- Secondary (12–17 years): Challenging numbers; fast pace; conditions can be added (gender diversity, grade, etc.).
- Adults: Use as an icebreaker in training sessions; can be combined with reflective questions or brief networking within each group.
- Intergenerational: Ensure each group has a variety of ages as an additional rule.
- Breaks social barriers; people must group with whoever is nearby, not just friends.
- Practices quick mental arithmetic (counting how many are needed to complete the number).
- Develops physical agility and spatial coordination.
- Fosters active inclusion: looking for whoever needs to complete a group.
- Generates laughter and positive energy in the group.
- Reduces social anxiety through structured, brief interaction.
- Creates a sense of temporary teamwork and solidarity ("we were saved together").
- For people with reduced mobility: allow others to come to them rather than requiring them to move quickly.
- For neurodiversity: announce in advance that there will be physical contact (hugs, holding hands) and offer alternatives (simply being close without touching).
- Monitor that no one is systematically excluded; intervene to facilitate inclusion.
- In groups with large differences in age or physical size, watch out for pushing or falls in the rush to group up.
- No-contact variant: groups form by standing very close in a circle without touching (useful in social-distancing contexts).
- How did you quickly decide who to group with?
- How did you feel when you did not manage to complete a group?
- Did anyone actively seek to include someone who needed a group? What was that like?
- What did you learn about working quickly as a team under pressure?
- What connection can you draw to real situations where we need to collaborate quickly?
