diff --git a/app/features/art/components/ArtImageFormField.tsx b/app/features/art/components/ArtImageFormField.tsx
index 42e0e2d42..3ed9b5f87 100644
--- a/app/features/art/components/ArtImageFormField.tsx
+++ b/app/features/art/components/ArtImageFormField.tsx
@@ -98,6 +98,7 @@ function compressToDataUrl(
 	options: Compressor.Options,
 ): Promise<string> {
 	return new Promise((resolve, reject) => {
+		// biome-ignore lint/correctness/noUnusedInstantiation: Compressor does its work through the success/error callbacks
 		new Compressor(file, {
 			...options,
 			success(result) {
diff --git a/app/features/chat/chat-message-links.ts b/app/features/chat/chat-message-links.ts
index 947564b71..24c100fdc 100644
--- a/app/features/chat/chat-message-links.ts
+++ b/app/features/chat/chat-message-links.ts
@@ -3,7 +3,7 @@ const SPLATNET_ROOM_PATH_PATTERN = /^\/[A-Za-z0-9/_-]+$/;
 const SPLATNET_ROOM_CANDIDATE_PATTERN = /https:\/\/s\.nintendo\.com\/\S+/g;
 
 export function isSplatnetRoomUrl(url: string): boolean {
-	if (!canParseUrl(url)) return false;
+	if (!URL.canParse(url)) return false;
 	const parsed = new URL(url);
 	return (
 		parsed.protocol === "https:" &&
@@ -29,15 +29,6 @@ export function findRoomLinks(
 	return results;
 }
 
-function canParseUrl(url: string): boolean {
-	try {
-		new URL(url);
-		return true;
-	} catch {
-		return false;
-	}
-}
-
 function isAllowedSplatnetSearch(params: URLSearchParams): boolean {
 	if (params.size === 0) return true;
 	if (params.size > 1) return false;
diff --git a/app/features/timezone/timezone-cookie.ts b/app/features/timezone/timezone-cookie.ts
index c09a57580..eb1b9af58 100644
--- a/app/features/timezone/timezone-cookie.ts
+++ b/app/features/timezone/timezone-cookie.ts
@@ -9,7 +9,7 @@ const ianaTimezone = v.pipe(
 	v.maxLength(100),
 	v.check((value) => {
 		try {
-			new Intl.DateTimeFormat("en-US", { timeZone: value });
+			Intl.DateTimeFormat("en-US", { timeZone: value });
 			return true;
 		} catch {
 			return false;
diff --git a/app/features/user-page/core/widgets/widget-form-schemas.ts b/app/features/user-page/core/widgets/widget-form-schemas.ts
index b3d0803bd..ee7dfac69 100644
--- a/app/features/user-page/core/widgets/widget-form-schemas.ts
+++ b/app/features/user-page/core/widgets/widget-form-schemas.ts
@@ -12,6 +12,7 @@ import {
 	select,
 	selectDynamic,
 	stageSelect,
+	textArea,
 	textAreaOptional,
 	textField,
 	weaponSelect,
diff --git a/app/form/fields/ImageFormField.tsx b/app/form/fields/ImageFormField.tsx
index b06e64a83..b51f24cbb 100644
--- a/app/form/fields/ImageFormField.tsx
+++ b/app/form/fields/ImageFormField.tsx
@@ -57,6 +57,7 @@ export function ImageFormField({
 		const uploadedFile = event.target.files?.[0];
 		if (!uploadedFile) return;
 
+		// biome-ignore lint/correctness/noUnusedInstantiation: Compressor does its work through the success/error callbacks
 		new Compressor(uploadedFile, {
 			width: resolvedDimensions.width,
 			height: resolvedDimensions.height,
diff --git a/biome.json b/biome.json
index 18acc7fe2..fe68e703b 100644
--- a/biome.json
+++ b/biome.json
@@ -19,7 +19,34 @@
 			"suspicious": {
 				"noExplicitAny": "off",
 				"noArrayIndexKey": "off",
-				"noConsole": { "level": "error" }
+				"noConsole": { "level": "error" },
+				"noDeprecatedImports": "error",
+				"noVar": "error",
+				"noForIn": "error",
+				"useGuardForIn": "error",
+				"noConstantBinaryExpressions": "error",
+				"noUnassignedVariables": "error",
+				"noDuplicatedSpreadProps": "error",
+				"noUnknownAttribute": "error",
+				"useErrorMessage": "error",
+				"useNumberToFixedDigitsArgument": {
+					"fix": "safe",
+					"level": "error"
+				},
+				"noSkippedTests": "error",
+				"noParametersOnlyUsedInRecursion": "error"
+			},
+			"correctness": {
+				"noUndeclaredVariables": "error",
+				"noUnusedInstantiation": "error",
+				"noNestedComponentDefinitions": "error",
+				"noReactPropAssignments": "error",
+				"noGlobalDirnameFilename": {
+					"fix": "safe",
+					"level": "error"
+				},
+				"useSingleJsDocAsterisk": "error",
+				"noUndeclaredDependencies": "error"
 			},
 			"style": {
 				"noNonNullAssertion": "off",
@@ -43,7 +70,43 @@
 				"useSingleVarDeclarator": "error",
 				"useNumberNamespace": "error",
 				"noInferrableTypes": "error",
-				"noUselessElse": "error"
+				"noUselessElse": "error",
+				"noEnum": "error",
+				"noCommonJs": "error",
+				"noParameterProperties": "error",
+				"noMultiAssign": "error",
+				"noMultilineString": "error",
+				"noYodaExpression": {
+					"fix": "safe",
+					"level": "error"
+				},
+				"useTrimStartEnd": {
+					"fix": "safe",
+					"level": "error"
+				},
+				"useObjectSpread": {
+					"fix": "safe",
+					"level": "error"
+				},
+				"useNodeAssertStrict": {
+					"fix": "safe",
+					"level": "error"
+				},
+				"useCollapsedElseIf": {
+					"fix": "safe",
+					"level": "error"
+				},
+				"useSymbolDescription": "error",
+				"useGroupedAccessorPairs": "error",
+				"useSpreadOverApply": "error",
+				"useFilenamingConvention": {
+					"level": "error",
+					"options": {
+						"filenameCases": ["kebab-case", "PascalCase", "camelCase"],
+						"strictCase": false,
+						"requireAscii": true
+					}
+				}
 			},
 			"a11y": {
 				"useKeyWithClickEvents": "off",
@@ -55,7 +118,14 @@
 					"fix": "safe",
 					"level": "error"
 				},
-				"noImportantStyles": "off"
+				"noImportantStyles": "off",
+				"useWhile": {
+					"fix": "safe",
+					"level": "error"
+				}
+			},
+			"performance": {
+				"noSyncScripts": "error"
 			}
 		}
 	},
@@ -74,6 +144,21 @@
 		}
 	},
 	"overrides": [
+		{
+			"includes": [
+				"app/features/*/routes/**",
+				"app/modules/*/routes/**",
+				"app/features/*/loaders/**",
+				"app/features/*/actions/**"
+			],
+			"linter": {
+				"rules": {
+					"style": {
+						"useFilenamingConvention": "off"
+					}
+				}
+			}
+		},
 		{
 			"includes": ["app/**", "!app/modules/search-params/**"],
 			"plugins": ["./biome-plugins/no-raw-search-params.grit"]