Students need one shared rule for switching corners, entering the game and handling the open player.
Teacher time disappears when the same moment has to be re-explained in real time.
Five players, four corners, one projected training system for safe switching, clear claims and fast tie disputes.

The hard moment arrives outside and students do not yet share one clear rule or repair language.
Teacher time disappears when the same moment has to be re-explained in real time.
The classroom version handles the structure so the teacher can supervise the room instead of operating another complicated system.
Practise the exact calls that cause confusion outside: switching, waiting, entering and resolving a disputed corner before the class reaches the playground.
A slow schoolyard moment unfolds and stops exactly where a call is needed.
Everyone votes; one random crew decides. A poor call shows its consequence and must be repaired.
The correct rule joins the class system and students use the same language outside.
Teacher-facing guides and support files stay here. The classroom launch remains a separate clean route.
Teacher method, setup, rules and transfer guidance.
Open resource ↗A quick-reference card for the real playground game.
Open resource ↗playground · switch · safe movement · recess
Open the classroom version full-screen. No advertising or payment prompt is loaded there.
Students often know the basic idea of Corner Switch. The teaching value is agreeing on the moments that normally stop play. Show what happens when two players believe they reached a corner first. A neutral tie rule prevents the fastest argument from becoming the rule.
Walk five students through one switch and one simultaneous arrival so everyone sees the space problem before the game speeds up. The tutorial should make the corner decision obvious, not recreate a whole recess indoors.
For a tie at a corner, use the agreed neutral decision immediately. The game depends on quick switching; a long argument destroys the rhythm more than a replay does.
Outside, watch whether students can keep the four corners clear and settle a tie without adult help. When they can, the teaching system has transferred and the game can run on its own.