diff --git a/README.md b/README.md
index 8c5a7cce2..ecf2a0dd0 100644
--- a/README.md
+++ b/README.md
@@ -72,8 +72,8 @@ Since version 2.0, Iosevka would no longer support building via `makefile`. To i
    # Override default building weights
    # When buildPlans.<plan name>.weights is absent
    # All weights would built and mapped to default shape/CSS
-   # IMPORTANT : Currently "shape" property only support 100, 200, 300, 400, 500, 600, 700, 800, 900.
-   [buildPlans.iosevka-custom.weights.regular]
+   # IMPORTANT : Currently "menu" property only support 100, 200, 300, 400, 500, 600, 700, 800, 900.
+   #              and "shape" properly only supports number between 100 and 900 (inclusive).
    shape = 400                            # Weight for glyph shapes
    menu  = 400                            # Weight for menu name
    css   = 400                            # Weight for WebFont CSS
diff --git a/build-plans.toml b/build-plans.toml
index 418bb46c1..292dca361 100644
--- a/build-plans.toml
+++ b/build-plans.toml
@@ -512,7 +512,8 @@ distinguishSlant = false
 #   Shape weight : affects the shape of the glyphs
 #   Menu weight  : affects the font menu name
 #   CSS weight   : affects the webfont CSS "font-weight" property
-# IMPORTANT : Currently "shape" property only support 100, 200, 300, 400, 500, 600, 700, 800, 900.
+# IMPORTANT : Currently "menu" property only support 100, 200, 300, 400, 500, 600, 700, 800, 900.
+#              and "shape" properly only supports number between 100 and 900 (inclusive).
 
 [weights.thin]
 shape = 100
@@ -573,6 +574,7 @@ italic = "italic"
 #   CSS stretch   : affects the webfont CSS "font-stretch" property
 #
 # IMPORTANT : Currently "shape" property only support 3, 5, and 7
+#              and "menu" only support 1, 2, 3, 4, 5, 6, 7, 8, 9
 
 [widths.normal]
 shape = 5
diff --git a/changes/3.0.0-beta.3.md b/changes/3.0.0-beta.3.md
index 6f8868cee..ea87cb4df 100644
--- a/changes/3.0.0-beta.3.md
+++ b/changes/3.0.0-beta.3.md
@@ -1,4 +1,5 @@
 * Made the curly-bar variant via OpenType tag `ss20`.
 * Alias U+2B95 to U+27A1.
 * Add symbol U+22DA, U+22DB, U+23B0, U+23B1, etc.
-* Finished the unicode block that supports retro computer characters.
\ No newline at end of file
+* Finished the unicode block that supports retro computer characters.
+* Building: The shape weight is now a continuous space.
diff --git a/gen/generator.js b/gen/generator.js
index b274194b6..5a4e48248 100644
--- a/gen/generator.js
+++ b/gen/generator.js
@@ -39,7 +39,7 @@ function getParameters(argv) {
 	);
 	const variantData = tryParseToml(VARIANTS_TOML);
 
-	const para = parameters.build(parametersData, argv._);
+	const para = parameters.build(parametersData, argv._, { "shape-weight": argv["shape-weight"] });
 	const variantsData = formVariantData(variantData, para);
 	para.variants = variantsData;
 	para.variantSelector = parameters.build(variantsData, ["default", ...argv._]);
diff --git a/glyphs/letters-unified-basic.ptl b/glyphs/letters-unified-basic.ptl
index 40fb8784f..2ec4f0390 100644
--- a/glyphs/letters-unified-basic.ptl
+++ b/glyphs/letters-unified-basic.ptl
@@ -603,7 +603,7 @@ export : define [apply] : begin
 	define { VShape VShapeOutline } : do "V, v and related ========================================"
 		define cornerdist : HALFSTROKE * HVCONTRAST * 1.15
 		define vcurviness : if (SLAB && !para.isItalic) 0.15 0.3
-		define VShapeFine : STROKE * [fallback para.vtipfine : if SLAB 0.9 0.8]
+		define VShapeFine : STROKE * [if SLAB para.vtipfineSlab para.vtipfine]
 		define VShapeFineStraight : Math.max [adviceBlackness 7] [STROKE * 0.66]
 		define VShapeMiddleWidth : adviceBlackness 3
 		define pInktrap 0.5
diff --git a/parameters.toml b/parameters.toml
index 6d43fc2aa..1e4e3ecba 100644
--- a/parameters.toml
+++ b/parameters.toml
@@ -24,7 +24,6 @@ arrowSize = 1.50
 pictSize = 1.10
 
 contrast = 1.11111 # Stroke width contrast.
-essx = 1.12        # Contrast of the middle of 'S'.
 
 slantAngle = 0     # Slant angle, in degrees.
 
@@ -35,42 +34,8 @@ overshootx = -8    # Horizontal overshoot for arcs.
 oxhook = -2        # Horizontal overshoot for hook tips.
 fovershoot = -40   # Overshoot of the top end of italic `f`.
 
-longjut = 175      # Length of long serifs, like that in `i`.
-jut = 85           # Length of short serifs, used in Slab only.
-vjut = 145         # Length of vertical serifs, used in Slab only.
-
-smooth = 195             # Vertical arc size in capital letters.
-smallsmooth = 200        # Vertical arc size in lowercase letters.
-smoothadjust = 120       # Parameter to balance arcs in slanted shapes.
-superness = 2.2          # Superness of arcs.
-tightHookSuperness = 2.3 # superness of tight hooks
-
-barpos = 0.525       # Position of the middle bar in most letters, like `E`.
-overlaypos = 0.52    # Position of the overlay mark.
-ebarpos = 0.50       # Position of the middle bar in `e`.
-gbarpos = 0.42
-fivebarpos = 0.64
-fbarpos = 0.91       # Position of the middle bar in `f`
-fbarStrokeAdj = 0.25 # Portion of the fill above the f-bar position
-
-hook  = 155        # Hook depth in most letters.
-ahook = 130
-shook = 110
-jhook = 135
-fhook = 120
-rhook = 110
-hookx = 170
-
 shoulderfineMin = 0.8
 
-tbalance = 50
-tbalance2 = 30
-rbalance = 60
-rbalance2 = 15
-jbalance = 63
-fbalance = 6
-onebalance = 30
-
 isItalic = false   # Use italic shapes?
 isOblique = false  # Use oblique shapes?
 
@@ -102,114 +67,175 @@ enableLigation = true
 # Excluded code points
 excludedCodePointRanges = []
 
-[verbose]
-verbose = true
+[shape-weight.blend.400]
+stroke = 72       # Primary stroke width
+sb = 60           # Primary sidebearings
+essx = 1.12       # Proportion of widen of center of "S"
+dotsize = 125     # Size of dots
+periodsize = 140  # Size of period
 
-### Weights
-[w-100]
+jut = 85          # Length of slab serif
+vjut = 145        # Length of vertical slab serif
+longjut = 175      # Length of long serifs, like that in `i`.
+
+smooth = 195             # Vertical arc size in capital letters.
+smallsmooth = 200        # Vertical arc size in lowercase letters.
+smoothadjust = 120       # Parameter to balance arcs in slanted shapes.
+superness = 2.2          # Superness of arcs.
+tightHookSuperness = 2.3 # superness of tight hooks
+
+barpos = 0.525       # Position of most crossbars
+overlaypos = 0.52    # Position of the overlay mark.
+ebarpos = 0.50       # Position of the middle bar in `e`.
+gbarpos = 0.42
+fivebarpos = 0.64
+fbarpos = 0.91       # Position of the middle bar in `f`
+fbarStrokeAdj = 0.25 # Portion of the fill above the f-bar position
+
+rbalance = 60
+rbalance2 = 15
+tbalance = 50
+tbalance2 = 30
+jbalance = 63
+fbalance = 6
+onebalance = 30
+
+hook  = 155        # Hook depth in most letters.
+ahook = 130
+shook = 110
+jhook = 135
+fhook = 120
+hookx = 170
+rhook = 110
+
+cthin = 0.75
+cthinb = 0.5
+vtipfine = 0.8
+vtipfineSlab = 0.9
+
+[shape-weight.blend.100]
+jut = 85
+vjut = 145
+smooth = 195
+barpos = 0.525
+rhook = 110
+rbalance = 60
+rbalance2 = 15
+cthin = 0.9
+cthinb = 0.9
+vtipfine = 1
+vtipfineSlab = 1
 stroke = 18
 sb = 72
 dotsize = 53
 periodsize = 55
 
-cthin = 0.9
-cthinb = 0.9
+[shape-weight.blend.200]
+jut = 85
+vjut = 145
+smooth = 195
+barpos = 0.525
+rhook = 110
+rbalance = 60
+rbalance2 = 15
+cthin = 0.75
+cthinb = 0.75
 vtipfine = 1
-
-[w-200]
+vtipfineSlab = 1
 stroke = 36
 sb = 68
 dotsize = 70
 periodsize = 77
 
+[shape-weight.blend.300]
+jut = 85
+vjut = 145
+smooth = 195
+barpos = 0.525
+rhook = 110
+rbalance = 60
+rbalance2 = 15
 cthin = 0.75
-cthinb = 0.75
-vtipfine = 1
-
-[w-300]
+cthinb = 0.5
+vtipfine = 0.9
+vtipfineSlab = 0.9
 stroke = 56
 sb = 64
 dotsize = 100
 periodsize = 115
 
-vtipfine = 0.9
-
-[w-400]
-sb = 60            # Side bearing.
-stroke = 72        # Stroke width of horizontal strokes.
-dotsize = 125      # "Visual" size of dots in /i.
-periodsize = 140   # "Visual" size of period.
-
-[w-500]
-sb = 57
+[shape-weight.blend.500]
+essx = 1.12
+jut = 85
+vjut = 157
+smooth = 200
+barpos = 0.525
+rhook = 110
+rbalance = 60
+rbalance2 = 15
 stroke = 84
+sb = 57
 dotsize = 135
 periodsize = 160
-smooth = 200
-vjut = 157
 
-[w-600]
-sb = 54
-stroke = 97
-dotsize = 145
-periodsize = 168
+[shape-weight.blend.600]
 essx = 1.07
+jut = 85
 vjut = 170
-
+smooth = 203
+barpos = 0.525
+rhook = 110
 rbalance = 55
 rbalance2 = 20
-smooth = 203
+stroke = 97
+sb = 54
+dotsize = 145
+periodsize = 168
 
-[w-700]
-sb = 50
-stroke = 106
-dotsize = 157
-periodsize = 180
+[shape-weight.blend.700]
 essx = 1.06
-essxq = 1.10
 jut = 89
 vjut = 179
-
+smooth = 206
 barpos = 0.51
-fivebarpos = 0.64
+rhook = 95
 rbalance = 52
 rbalance2 = 23
-rhook = 95
-smooth = 206
+stroke = 106
+sb = 50
+dotsize = 157
+periodsize = 180
 
-[w-800]
-sb = 45
-stroke = 116
-dotsize = 167
-periodsize = 188
+[shape-weight.blend.800]
 essx = 1.05
-essxq = 1.15
 jut = 96
 vjut = 189
-
+smooth = 210
 barpos = 0.51
-fivebarpos = 0.64
+rhook = 97
 rbalance = 50
 rbalance2 = 25
-rhook = 97
-smooth = 210
+stroke = 116
+sb = 45
+dotsize = 167
+periodsize = 188
 
-[w-900]
-sb = 42
-stroke = 126
-dotsize = 180
-periodsize = 200
+[shape-weight.blend.900]
 essx = 1.03
-essxq = 1.15
 jut = 100
 vjut = 199
-
+smooth = 215
 barpos = 0.51
-fivebarpos = 0.64
+rhook = 105
 rbalance = 50
 rbalance2 = 25
-rhook = 105
-smooth = 215
+stroke = 126
+sb = 42
+dotsize = 180
+periodsize = 200
+
+[verbose]
+verbose = true
 
 ### Slantness
 [s-italic]
diff --git a/private-build-plans.sample.toml b/private-build-plans.sample.toml
index 25de86b4d..b997a8552 100644
--- a/private-build-plans.sample.toml
+++ b/private-build-plans.sample.toml
@@ -7,7 +7,8 @@ hintParams = ["-a", "sss"]                          # Optional custom parameters
 # Override default building weights
 # When buildPlans.<plan name>.weights is absent
 # All weights would built and mapped to default shape/CSS
-# IMPORTANT : Currently "shape" property only support 100, 200, 300, 400, 500, 600, 700, 800, 900.
+# IMPORTANT : Currently "menu" property only support 100, 200, 300, 400, 500, 600, 700, 800, 900.
+#              and "shape" properly only supports number between 100 and 900 (inclusive).
 [buildPlans.iosevka-custom.weights.regular]
 shape = 400                            # Weight for glyph shapes
 menu  = 400                            # Weight for menu name
diff --git a/support/param-blend.js b/support/param-blend.js
new file mode 100644
index 000000000..3781f03a7
--- /dev/null
+++ b/support/param-blend.js
@@ -0,0 +1,28 @@
+const blend = require("./monotonic-interpolate");
+
+module.exports = function(aspect, hive, params, sink) {
+	if (!hive || !hive.blend || !params) return;
+
+	const block = hive.blend;
+	let keys = new Set();
+	for (const grade in block) {
+		if (!isFinite(parseFloat(grade))) continue;
+		for (const key in block[grade]) {
+			if (block[grade][key] == null) continue;
+			keys.add(key);
+		}
+	}
+
+	for (const key of keys) {
+		let xs = [],
+			ys = [];
+		for (const grade in block) {
+			if (!isFinite(parseFloat(grade))) continue;
+			if (block[grade][key] == null) continue;
+			xs.push(grade);
+			ys.push(block[grade][key]);
+		}
+		const fn = blend(xs, ys);
+		sink[key] = fn(params[aspect]);
+	}
+};
diff --git a/support/parameters.ptl b/support/parameters.ptl
index 8deb31aa0..df1829d1b 100644
--- a/support/parameters.ptl
+++ b/support/parameters.ptl
@@ -1,17 +1,20 @@
-export : define [build parametersData styles] : begin
-	local param {.}
-	
-	define [introStyle style] : begin
-		local hive parametersData.(style)
-		if (!hive) : return nothing
-		if hive.inherits : foreach [h : items-of hive.inherits] : introStyle h
-		foreach [k : items-of : Object.keys hive] : set param.(k) hive.(k)
-		if hive.multiplies : foreach [k : items-of : Object.keys hive.multiplies] : begin
-			set param.(k) : param.(k) * hive.multiplies.(k)
-		if hive.adds : foreach [k : items-of : Object.keys hive.adds] : begin
-			set param.(k) : param.(k) + hive.adds.(k)
-		if hive.appends : foreach [k : items-of : Object.keys hive.appends] : begin
-			set param.(k) : (param.(k) || {}).concat(hive.appends.(k))
-	
-	foreach [style : items-of styles] : introStyle style
-	return param
+import "./param-blend" as paramBlend
+
+export : define [build parametersData styles blendParams] : begin
+	local param {.}
+
+	define [introStyle style] : begin
+		local hive parametersData.(style)
+		if (!hive) : return nothing
+		if hive.inherits : foreach [h : items-of hive.inherits] : introStyle h
+		foreach [k : items-of : Object.keys hive] : set param.(k) hive.(k)
+		if hive.multiplies : foreach [k : items-of : Object.keys hive.multiplies] : begin
+			set param.(k) : param.(k) * hive.multiplies.(k)
+		if hive.adds : foreach [k : items-of : Object.keys hive.adds] : begin
+			set param.(k) : param.(k) + hive.adds.(k)
+		if hive.appends : foreach [k : items-of : Object.keys hive.appends] : begin
+			set param.(k) : (param.(k) || {}).concat(hive.appends.(k))
+		paramBlend style hive blendParams param
+
+	foreach [style : items-of styles] : introStyle style
+	return param
diff --git a/verdafile.js b/verdafile.js
index fecb02e22..63a9257fe 100644
--- a/verdafile.js
+++ b/verdafile.js
@@ -128,6 +128,25 @@ function makeSuffix(w, wd, s, fallback) {
 	);
 }
 
+function nValidate(key, v, f) {
+	if (typeof v !== "number" || !isFinite(v) || (f && !f(v))) {
+		throw new TypeError(`${key} = "${v}" is not a valid number.`);
+	}
+	return v;
+}
+function vlShapeWeight(x) {
+	return x >= 100 && x <= 900;
+}
+function vlMenuWeight(x) {
+	return x >= 100 && x <= 900 && x % 100 === 0;
+}
+function vlShapeWidth(x) {
+	return x === 3 || x === 5 || x === 7;
+}
+function vlMenuWidth(x) {
+	return x >= 1 && x <= 9 && x % 1 === 0;
+}
+
 function getSuffixSet(weights, slants, widths) {
 	const mapping = {};
 	for (const w in weights) {
@@ -135,13 +154,15 @@ function getSuffixSet(weights, slants, widths) {
 			for (const wd in widths) {
 				const suffix = makeSuffix(w, wd, s, "regular");
 				mapping[suffix] = {
-					hives: [`w-${weights[w].shape}`, `s-${s}`, `wd-${widths[wd].shape}`],
+					hives: [`shape-weight`, `s-${s}`, `wd-${widths[wd].shape}`],
 					weight: w,
-					cssWeight: weights[w].css || w,
-					menuWeight: weights[w].menu || weights[w].css || w,
+					shapeWeight: nValidate("Shape weight of " + w, weights[w].shape, vlShapeWeight),
+					cssWeight: nValidate("CSS weight of " + w, weights[w].css),
+					menuWeight: nValidate("Menu weight of " + w, weights[w].menu, vlMenuWeight),
 					width: wd,
+					shapeWidth: nValidate("Shape width of " + wd, widths[wd].shape, vlShapeWidth),
 					cssStretch: widths[wd].css || wd,
-					menuWidth: widths[wd].menu || widths[wd].css || wd,
+					menuWidth: nValidate("Menu width of " + wd, widths[wd].menu, vlMenuWidth),
 					slant: s,
 					cssStyle: slants[s] || s,
 					menuStyle: slants[s] || s
@@ -184,6 +205,8 @@ const FontBuildingParameters = computed(`metadata:font-building-parameters`, asy
 				name: fileName,
 				family,
 				hives: ["iosevka", ...preHives, ...suffixMapping[suffix].hives, ...postHives],
+				shapeWeight: suffixMapping[suffix].shapeWeight,
+				shapeWidth: suffixMapping[suffix].shapeWidth,
 				menuWeight: suffixMapping[suffix].menuWeight,
 				menuWidth: suffixMapping[suffix].menuWidth,
 				menuStyle: suffixMapping[suffix].menuStyle,
@@ -289,10 +312,10 @@ const CollectionPartsOf = computed.group("metadata:collection-parts-of", async (
 const BuildTTF = file.make(
 	(gr, fn) => `${BUILD}/${gr}/${fn}.ttf`,
 	async (target, output, _gr, fn) => {
-		const [{ hives, family, menuWeight, menuStyle, menuWidth }, version] = await target.need(
-			HivesOf(fn),
-			Version
-		);
+		const [
+			{ hives, family, shapeWeight, menuWeight, menuStyle, menuWidth },
+			version
+		] = await target.need(HivesOf(fn), Version);
 		const otd = output.dir + "/" + output.name + ".otd";
 		const ttfTmp = output.dir + "/" + output.name + ".tmp.ttf";
 		const otdTmp = output.dir + "/" + output.name + ".tmp.otd";
@@ -304,6 +327,7 @@ const BuildTTF = file.make(
 			["--charmap", charmap],
 			["--family", family],
 			["--ver", version],
+			["--shape-weight", shapeWeight],
 			["--menu-weight", menuWeight],
 			["--menu-slant", menuStyle],
 			["--menu-width", menuWidth],