Harry Potter and the Order of the Phoenix (Nintendo DS)
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Attacking teachers
Although they cast Expelliarmus and deduct ten house points, you can cast combat spells at teachers.
Casting spells on items
Look around in the Room Of Requirement. There are some items here that you can cast spells on.
Defeating Voldemort
When playing as Dumbledore fighting against Voldemort, do not try casting Levicorpus or Petrificus Totalus as they do not work against him. When Voldemort is on the platform the first time, you can only hurt him when he unleashes his stored power at you. Use Protego to deflect his magical blast.
Finding Luna's belongings
One of her items is in the Viaduct entrance next to the bookshelf and the stuttering portrait. Another one is located in the Courtyard before the covered bridge directly in front of the fountain.
Flying Creatures
The following flying creatures must be found for the Room of Rewards.
Seagulls can be found at the boathouse.
Crows are at the Stone Circle.
Pixies are in a desk in the Defense Against the Dark Arts room.
Doves are at the bridge at the Viaduct.
Bats are below the Stone Bridge. Go to the Stone Bridge and light all the torches with Incendio. Then, climb down the pipe shown and maneuver your way to the bottom. You will discover the bats.
Herbology discoveries
In the Herbology classroom, walk into the room with four flower pots on a table. You will see a bucket hanging on the ceiling above the dancing water can. Wingardium Leviosa the bucket and let it hover over each of the pots. It will pour dirt into them. Then Wingardium Leviosa the water can. Hover it over each dirt-filled pot until it spews water on them. Spikey-plants will grow. You will receive Discovery Points. Then, go to the entrance of the Herbology room. Walk forward into the dead-end hallway directly in front of the door in the classroom. You will see a rope hanging up in a corner. Use Accio. It will air out the room and give you Discovery Points.
House Ghosts
To reveal the House Ghosts needed for the Room of Rewards, find the fallen portraits throughout the Hogwarts corridors. Use Wingardium Leviosa to hang them back up on the wall. The Bloody Baron's portrait is in the Dungeons. The Grey Lady's portrait is near the library on the second floor. The Fat Friar's portrait is on the first floor near the exit to the Stone Bridge.
Howlers
When you ascend or descend the steep, narrow staircase that connects the Dungeons to the Viaduct Entrance, you can hear howlers being played.
Luna's lost belongings
In the Entrance Courtyard. Use Wingardium Leviosa on the broom and sweep the leaves on the right side of the courtyard.
In the Great hall on the table.
In the Viaduct Entrance in front on the bookcase next to the stuttering portrait.
In the Clock Tower Courtyard directly in front of the Fountain.
In the Library on the table.
Talking Gargoyles
To find the five Talking Gargoyles for Dean, look in the following areas.
In the courtyard where Dean is standing.
The spiral staircase when you walk up to DADA.
In the Viaduct.
The fourth floor outside in the balcony.
In the Paved Courtyard.. You must repair the broken staircase in the corner. It is at the end of the balcony in the corner.
Tidying Up Hogwarts
Go to the Entrance Hall. Go in the small custodian room to the left of the large exit doors. Wingardium Leviosa the mop and hover it over each of the four odd tiles by the golden statue. It will clean them. You will get Discovery Points, and Hermione will talk, giving you a 100% on the Marauder's Map. Then, go to the Viaduct Entrance. Wingardium Leviosa the mop near the dungeon stairs and clean the odd tiles by the large staircase. You will get Discovery Points.
Trophies in the Room of Rewards
Perform the following tasks to unlock new trophies in the Room of Rewards:
Effect - Code
Architecture Cup: Find the 12 Hogwart's Emblems.
Characters Cup: Talk to all the characters at Hogwart's.
Defense against the Dark Arts Cup: Cast each defensive spell in six duels.
Exploding Snap Cup: Defeat both Exploding Snap Champions.
Explorer Cup: Explore each area of Hogwart's.
Famous Wizards and Witches Cup: Find the fifteen Wizard Plaques.
Friends of the Year Cup: Complete the game after finding all of Luna's lost items.
Golden Gobstone Cup: Defeat all four Gobstone Champions.
Grandmasters Cup: Defeat all three Wizard Chess Champions.
Homework Cup: Complete all of the Teachers' sub-quests.
House Ghost Cup: Find all four ghosts.
Nature Trail Cup: Find all the animal footprints.
Ornithology Cup: Find all five flying animals.
Portrait Password Cup: Find all twelve portrait passwords.
School Pride Cup: Complete all 66 chores.
Secret Statue Cup: Find all twelve Wizard Chess statues.
Smuggler's Cup: Find all twelve of Fred and George's secret packages.
Studious Success Cup: Receive the highest grade in all lessons.
Using spells on objects
Any time you see any object begin to light up, cast spells until you find the correct one, then do it again on the others. If you see a student light up, then hold R1 and cast a dueling spell.