Go on any portal you want. Just before you start spinning and are transported, run in circles counter-clockwise (going clockwise will make you go into the portal). Keep going in this way until the portal disappears.
Cheat List
Enter the following codes as your name for the desired effect.
Invincibility: INVULN. Then use the Invulnerability like an item.
Permanent super shot with large crossbow: SSHOTS
Permanent Pojo the Chicken: EGG911
Permanent Anti-Death and unlimited levitation: 1ANGEL
Permanent invisibility: 000000
Permanent x-ray vision: PEEKIN
Permanent full turbo: PURPLE
Permanent triple shot: MENAGE
Permanent reflect shot: REFLEX
Permanent shrink enemy and growth: DELTA1
Full potions and keys: ALLFUL
Quick Run: XSPEED
Throw quickly: QCKSHT
10,000 gold per level: 10000K
Dwarf is a large jester: ICE600
Dwarf in S&M costume: NUD069
Jester as a stick figure with smiley face: STX222
Jester as a stick figure with baseball cap head: KJH105
Jester as a stick figure with Mohawk head: PNK666
Knight as a Roman centurion: BAT900
Knight as a ninja costume: TAK118
Knight as bald man in street clothes: STG333
Knight as a waitress: KAO292
Knight wears street clothes: CSS222
Knight wears street clothes: ARV984
Knight wears street clothes and baseball cap: DIB626
