on rightclick:
	block is a sign
	line 1 of clicked block is "=========="
	line 2 of clicked block is "&4checkpoint"
	line 3 of clicked block is "&1[rightclick]"
	line 4 of clicked block is "=========="
	set {checkpoint.%player%} to location of player
	message "<gold>checkpoint saved!!"
	command "/spawnpoint %player% ~ ~ ~"

ネザー水晶ブロックに乗ったらスポーンポイントに戻される

on walking on normal quartz block:
( tab ) player's gamemode is adventure
( tab ) teleport player to {checkpoint.%player%}